It appears that the Screenie was taken at a later point as you can see the scroll bar is a third up the page, not to mention the person is now in an alliance.
I guess I think if it was legit they would have SS'd it the second it got appraised instead of some quite a bit later in their log.
Also, and this may just be due to being unfamilar with assault, but it calls it a ??? Bow & Culverin is a gun, I'm not sure if ??? Bow covers a variety of different ranged weapons or not though.
I wasn't confirming the legitimacy of the picture, but just stating why there was no treasure box. I am not sure about the Gun being under Bow Category either, as Gun falls and is applicable to Marksman rules and not archery rules.
Oh... I thought that the point was that they appraised a bow, and it ended up being a gun. I didn't realize that an HQ Culverin wasn't supposed to drop from Assault, lol.