Seems to me if you return something at WalMart, the buyer has to actually "return" it first...then you get the $$$. DrDirt seems to be a stand up guy so the question is are you? Confess right now if you're going to send the $$$ or dick him around...
Did you send the turbo and then he sent the $$$ - doesn't seem like how things usually go so to unwind the scenario just go in reverse. But you have to keep your end of the deal...