I'm under the impression invoices are routinely examined as part of the research performed for SWHF letters---today, sometimes even copied and sent along with the letters. Yes? It occurs to me to also ask if invoices were routinely examined as part of the research performed for factory letters back in the day----2004 to be exact? I think they were, simply because letters from that era (and before and after) oft times noted the price charged for individual guns. Of course, that sort of information could have just as easily been obtained from (historical) price lists.

Same church-different pew, if the answer to my first question is No, not routinely, but on occasion (or some such), under what circumstances might invoices have been examined as part of such research?

Many Thanks !

Ralph Tremaine