Sorry, I meant Truly's office, or "at the PD" as you said here:
It's possible that a Mauser was in fact found in Truly's office and that may be the rifle that Seymour Weitman was asked to examine?? Perhaps the numbskull Fritz picked up the Mauser ( mistaking it for the Carcano) and asked Weitzman to examine that rifle to determine the mke and model of the rifle..... I would remind you that they didn't know what kind of rifle they had that afternoon... and they thought that Weitzman was an expert. So perhaps Fritz asked Weitzman to come to the PD and identify the rifle..... But the numbskull picked up the mausr by mistake and that's th rifl Weitzman examined....