Seems straight fwd to me - Paid deposit, wants deposit back so he needs to sell game. Hoping to just have a deal to sell it to next person and not hold it trying to sell.
Unfortunately more likely op will have to Pay the rest on it and pick it up and get more photos up for it and relist with those. But who knows
I don’t think there’s any small claims to be made here, deposits are usually non-refundable .. that’s kinda the point unless explicitly stated to be refundable