I'd trust you to know your own weapons and to not hassle this man for no reason. [Plus, well, Maria recognizes the weapon; even if she doesn't know the details as intimately as he does, she recognizes the shape, the personal touches he'd added. The differences between it and her own weapon.

Having one linefacing Witch accosting the man is one thing - having a second is clearly even more intimidating, and it seems the shopkeep is getting blustery.] I suppose he's arguing that he found, or stole it fairly and squarely?