Charlie B...If your LOA is for a revolver shipped in 1947 to 1966, Roy will sometimes include a copy of the invoice for your records. He does not include copies of documents for pre-war guns (1920-1946). You can request a Foundation Letter by going to the website
swhf and clicking on Foundation Letter. The cost is $45 for the letter and $5 per each document provided. There is no charge for the search if no documents are found. You need a letter of authenticity first, as the shipping date and location aide in the search.
Bill