The storehouse in the wharves district is a great hall full of shelves with crates and boxes, and a desk in front of it. The stiff-collared person behind the desk is quite rude and haughty, chin up. The storehouse is a place for found and retrieved items, unclaimed cargo, and temporary deposits.
One of the items on the shelves behind the clerk is apparently labeled "Dragon's tinkerbox". You'll need the proper receipt if you want it.