The very detailed description given by Seymour Weitzman cannot be dismissed as the "quick glimpse" that Weitzman said he got of the rifle as it lay on the floor beneath the boxes of books. The fact that FBI agent A1bert Sawyers said that Captain Fritz came and took the rifle away from Weitzman, is a positive statement that Weitzman actually had the 7.65 Mauser in his hands.
We know that Fritz never took any rifle away from Weitzman in the TSBD that afternoon.....So when did Fritz present a mauser to Weitzman , and what was Fritz's motive from putting Weitzman on record as identifying a rifle as a 7.65 Mauser??
Whaddya mean by "very detailed?" The color of the rifle's metal, color and general surface and condition of the stock, and the sling are things that could be gathered in seconds from 10 feet. The wear on the safety, rear bolt, and bolt handle don't require much study of the rifle, even a few feet away. Ditto with the white letters on the black scope.
If it were a "very detailed" description I would expect to see a mention of the "Modelo Argentino 1891" that is prominently engraved on the side of the receiver and a serial number, which would appear in several places on the rifle. And Mr Craig reminds me the we should also have expected to see where the Argentine national crest had been removed from the top of the receiver, along with the bluing.