# WTC6 upper steel: public archive component pass

Date: 2026-09-26. Scope: the NYSA 21693 folder-list dependency and federal Custom House records. This pass recovered **no building-specific upper, changed-level, roof or base-transfer framing sheet**. New geometry: **0**. No model or shared application files were edited.

## Exact next retrieval record

The strongest drawing lead remains **New York State Archives series 21693, “New York State Emergency Management Office Emergency Operations Center Activation Documentation Unit Records.”** Its finding aid explicitly includes U.S. Custom House plans and drawing indexes. The next dependency is the **repository-held folder list/drawing index**, followed by positively titled Custom House framing scans. No exact Custom House sheet numbers have been acquired. [Official finding aid](https://findingaids.nysed.gov/do/ea4c9350-bec0-5315-a90e-ed712d8f5a88).

Observed identifiers:

- Series: `21693`; EAD identifier: `1557`.
- Embedded ArchivesSpace resource URI: `/repositories/2/resources/957`. This is an internal resource identifier, not a verified public endpoint.
- Alternate public record: [`node/336811`](https://findingaids.nysed.gov/node/336811).
- Original [EAD XML](https://findingaids.nysed.gov/do/ea4c9350-bec0-5315-a90e-ed712d8f5a88/file/98cee61a-df69-4178-aa5b-72f349a12b39/download/21693.xml), created 2026-01-13: empty `<dsc/>`; `otherfindaid` says “Folder list is available at the repository.”

The alternate record exposes the same XML download. Its public links provide no folder list, component inventory or plan scan. The institutional keyword search and 16-result World Trade Center corporate-name facet added no public component index. Those observations describe the inspected representations; they do not prove that the repository has no digital copies.

The adjacent **B1920, World Trade Center Geospatial Data**, describes aerial/thermal imagery and GIS of the site after the attack. It was excluded from intact upper-steel reconstruction. [B1920 finding aid](https://findingaids.nysed.gov/do/e381c66d-80ca-51c2-945c-bb42c634b2bb).

## Federal catalog pass

The public National Archives Catalog was searched through its visible interface. The result counts below are search matches, not counts of Custom House drawing records.

| Query/filter | Matches | Inspection and outcome |
| --- | ---: | --- |
| `"World Trade Center" "Custom House"` | 102 | First 20 result cards inspected. Administrative/hearing and historic-property material; no positively attributed WTC6 framing card recovered. |
| `"6 World Trade Center"` | 113 | First 20 result cards and record-group facets inspected. Most sampled records were USITC publications or press releases. No exhaustive review of all 113 records claimed. |
| Same exact address, Photographs and other Graphic Materials | 2 | Both result cards inspected; both are African Burial Ground books in RG79, Cultural Resource Management Records. |

The two filtered records are [NAID 183509330](https://catalog.archives.gov/id/183509330), *Ethnographic Overview and Assessment Sourcebook* (2012), container 26; and [NAID 183509323](https://catalog.archives.gov/id/183509323), *Unearthing the African Presence in Colonial New York* (2009, part 3 of 8), container 25. Their cards do not identify WTC6 structural drawings. Books were not acquired. [Exact filtered search](https://catalog.archives.gov/search?page=1&q=%226%20World%20Trade%20Center%22&typeOfMaterials=Photographs%20and%20other%20Graphic%20Materials).

The official **RG36 Customs Service** guide primarily identifies older district and operational material; its named architectural groups do not identify intact WTC6 framing. **RG121 Public Buildings Service** lists broad architectural holdings through 1974 without a positively identified WTC6 component. These guides establish record-group leads only; neither is evidence of a particular acquired plan or of absence from all federal holdings. [RG36 guide](https://www.archives.gov/research/guide-fed-records/groups/036.html), [RG121 guide](https://www.archives.gov/research/guide-fed-records/groups/121.html).

## Modeling consequence

This pass supplies no coordinates, member schedules, grid dimensions, level changes, shaft masks, upper edges or roof framing. Existing plaza-derived geometry cannot acquire upper-plan verification from a catalog description. Integration authorization does not change those evidence limits. The parent can continue the authorized model work, with any extrapolated upper steel retaining its estimated status until actual framing sheets are acquired.

No geometry registration or tracing precision is applicable to these new artifacts: they are catalog/finding-aid records, not drawings. The existing adapter and geometry were untouched by this pass. No outreach, orders, purchases or guessed drawing identifiers were used.

## Durable audit

[Round5 audit JSON](wtc6-round5-archive-audit.json) lists exact URLs, titles, download byte counts and SHA-256 hashes. It also records the checked original XML hash and search coverage limits. [NARA selected visible result fields](wtc6-round5-archive-nara-results.json) preserves the two filtered result cards; it is a manual UI extract, not an original catalog export.

Saved HTML artifacts: `wtc6-round5-archive-nysa-node.html`, `-nysa-search.html`, `-nysa-corporate.html`, `-nysa-geospatial.html`, `-nara-rg036.html`, and `-nara-rg121.html`. These contain discovery evidence only.