Ask H&H: ‘lost’ saddle

When I bought a new saddle in the summer, the shop owner said they’d sell my old one for me. So I took the old saddle into the shop and we verbally agreed that they’d keep it until it was sold, and take a 10% commission for selling it. I didn’t find time to go back to the shop till last month, and when I did the owner denied all knowledge of ever having my saddle. I didn’t get anything in writing. What can I do about this?

QW