Getting the weapons from formorian pirate

Ok this one's legit. I got to the pirate, killed his guards and he says he'll give me the weapons, if I bring him the chest. I've searched the whole ship, every barrel downstairs and tapped/attacked each wall trying to find a secret room, but no chest. The ship is small so I must be missing something..?

Tap the golden reliefs upstairs.

I thought I had! But that sure did it, thank you!