Your knackered either way... wire fraud has popped off these last couple of months. We recently sold a property and the title company required a hard cashier's check from the buyer because they had recently "lost" a $500k wire.
I think you should just require a duff b of cash...
Ha. I'd like to see Jim's face if I dropped a duffle bag on his desk.
Don't ask any questions, don't mess with serial numbers....just take my cash
(I promise it won't turn your face blue when you open it)