According to the FBI Document:

The Rubber stamp and Printing standards Reference File is (was?) located in Room 3161 of the FBI.

This reference file contains approximately 100 type style catalogs for rubber stamp production and mechanical printing use.

This reference collection also contains the Printing Process Identification Micro graph Reference Collection, which contains 20 sets of printed  samples that are representative of the four primary printing processes (letterpress, offset and intagleo).

This file was began by J. Edgar Hoover, who wrote different companies personally looking for catalogs and samples of their rubber stamps and type face printing.

This was used throughout the decades, but come the late 1980s, was barely used and was later re-evaluated on whether or not it was still worth keeping.

It was released to The Black Vault in October of 2015, and archived here:

The Rubber stamp and Printing standards Reference File

The file was released to me on CD-ROM, in three files. They are as follows (in order):

blank 1266834-0 – 080-HQ-613 – 080-HQ-613-Section 01-Imported Media.PDF

blank 1266834-0 – 080-HQ-613 – 080-HQ-613-Section 02-Imported Media.PDF

blank 1266834-0 – 080-HQ-613 – 080-HQ-613-Section 03-Imported Media.PDF

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