REVIEWED — 050 SCRIBD US WAYBACK ARCHIVE LOOKUP
Completed 2026-09-05 UTC. All four CDX queries (two original exact-slug queries and two authorized ID-prefix follow-ups) succeeded and returned empty arrays. No archived original document body or independent date was recovered; DOC1-SEC1-P0 and DOC2-SEC1-P0 remain snippet-only leads as assessed in 035.

Original exact-slug coverage
Used the existing authorized AWS us-east-1 machine through SSH for ordinary IPv4 HTTPS to web.archive.org/cdx/search/cdx. Two exact full-URL queries, each limited to 20 records, HTTP200 capture filter, upper capture-date bound September 3, 2026 inclusive, no lower date bound. No URL-key collapse was requested.

doc1: https://www.scribd.com/document/1041205392/scribd-upload-document-1
Query started 2026-09-05T12:08:20.034338+00:00. HTTP 200; curl/SSH exit 0; valid JSON array with 0 capture rows; 3 response bytes. SHA256 37517e5f3dc66819f61f5a7bb8ace1921282415f10551d2defa5c3eb0985b570.
Exact query: https://web.archive.org/cdx/search/cdx?url=https%3A%2F%2Fwww.scribd.com%2Fdocument%2F1041205392%2Fscribd-upload-document-1&matchType=exact&to=20260903&limit=20&output=json&fl=timestamp%2Coriginal%2Cstatuscode%2Cmimetype%2Cdigest&filter=statuscode%3A200

doc2: https://www.scribd.com/document/1041205258/scribd-upload-document-2
Query started 2026-09-05T12:08:24.108110+00:00. HTTP 200; curl/SSH exit 0; valid JSON array with 0 capture rows; 3 response bytes. SHA256 37517e5f3dc66819f61f5a7bb8ace1921282415f10551d2defa5c3eb0985b570.
Exact query: https://web.archive.org/cdx/search/cdx?url=https%3A%2F%2Fwww.scribd.com%2Fdocument%2F1041205258%2Fscribd-upload-document-2&matchType=exact&to=20260903&limit=20&output=json&fl=timestamp%2Coriginal%2Cstatuscode%2Cmimetype%2Cdigest&filter=statuscode%3A200

Interpretation and limits
These are successful empty results, not blocked fetches. Prior report 048 established that the same US route returns real nonempty index rows for other targets. No returned capture pointer existed, so zero archived-body GETs were attempted. No dates, uploader names, full document text or agent execution evidence were recovered. The absence of indexed successful captures for these two exact URLs does not prove that documents were absent earlier. At the original checkpoint, alternate title slugs and bare-ID paths were outside the exact-slug lookup. The ID-prefix extension below now covers the requested document-path prefixes; embed/download routes, other language domains, non-200 records and captures after the cutoff remain outside scope.
The original direct Scribd responses remain client challenges. This work did not repeat them or bypass those challenges: zero live Scribd origin requests, no login, no credentials, no document script/instruction execution, no opaque proxy service, and no redirect following. Only public archive index requests were sent from an already authorized machine.

Pacing and coordination — corrected after ledger review
The 051 ledger records query starts at 12:08:06.001174 and 12:08:09.883195 UTC. Its final home.raw file was written at 12:08:18.751180 UTC, with metadata saved immediately after. The 050 ledger records starts at 12:08:20.034338 and 12:08:24.108110 UTC. Thus the other script's final response was already saved before this script began: no requests overlapped. The earlier possible-overlap wording was provisional and is withdrawn. Each script used a 1.6-second internal pause, but the measured cross-script gap from 051's saved response to 050's start was about 1.28 seconds, so a universal 1.6-second gap is not claimed. No additional request was made for this correction.

URL canonicalization and remaining query scope
The original saved manifests explicitly use matchType=exact and include the full title slug. Neither original query contains an ID wildcard or requests prefix matching. Therefore these two successful empty results must not be summarized as zero captures for every URL carrying either document ID. Alternate title slugs, a bare /document/ID URL, and path/slash variants may fall outside the checked canonical URL keys. Common index canonicalization may merge some scheme, hostname or punctuation variants, but this run did not test or prove which variants were merged.
Authorized ID-prefix extension — completed
The parent authorized the proposed broader document-path prefix lookup. Two additional CDX calls used matchType=prefix on /document/1041205392 and /document/1041205258, each limit30, HTTP200 capture filter and September3 cutoff, with no lower date bound or collapse. Returned URL paths would be checked for an exact numeric document-ID segment, excluding any longer ID sharing the prefix. Both responses were HTTP200 valid empty JSON arrays. Each returned zero rows, zero validated rows and zero rejected-prefix rows; neither reached the 30-row cap. These are successful empty responses, not failures or query-cap truncation. No body pointers existed and zero archived-body GETs followed.

Artifacts
Reproducible script: investigation/china/050-scribd-wayback.py
Private directory: investigation/china/050-scribd-archive/ (owner access only).
Saved doc1.raw, doc2.raw and metadata-private.json with exact queries, UTC times, response statuses and hashes. No archive body exists to save. The original authorization cap was two CDX queries and at most two body GETs; its actual use was two and zero. The separately authorized ID-prefix extension adds two CDX queries and zero body GETs, as recorded below.

ID-prefix exact request ledger
prefix-doc1: started 2026-09-05T12:12:50.635170+00:00; HTTP200, exit0, rows0, cap_reached=False, bytes3, SHA256 37517e5f3dc66819f61f5a7bb8ace1921282415f10551d2defa5c3eb0985b570.
https://web.archive.org/cdx/search/cdx?url=https%3A%2F%2Fwww.scribd.com%2Fdocument%2F1041205392&matchType=prefix&to=20260903&limit=30&output=json&fl=timestamp%2Coriginal%2Cstatuscode%2Cmimetype%2Cdigest&filter=statuscode%3A200
prefix-doc2: started 2026-09-05T12:12:53.901129+00:00; HTTP200, exit0, rows0, cap_reached=False, bytes3, SHA256 37517e5f3dc66819f61f5a7bb8ace1921282415f10551d2defa5c3eb0985b570.
https://web.archive.org/cdx/search/cdx?url=https%3A%2F%2Fwww.scribd.com%2Fdocument%2F1041205258&matchType=prefix&to=20260903&limit=30&output=json&fl=timestamp%2Coriginal%2Cstatuscode%2Cmimetype%2Cdigest&filter=statuscode%3A200

Extension script: investigation/china/050-scribd-prefix-wayback.py. Private prefix-doc1.raw, prefix-doc2.raw and prefix-metadata-private.json preserve responses and validation counts alongside the original evidence. Calls were sequential and internally paced by1.6seconds; parent confirmed no other Wayback work for this extension. No live Scribd origin requests, login, challenge bypass or instruction execution occurred. Cumulative report050 use: four CDX queries, zero archive-body GETs. No document body, uploader or independent date recovered. The title-slug scope gap is narrowed by the empty ID-prefix lookup; no claim of universal archive absence is warranted.