Possible credit card scam or scam in general?

I have a screenprinting shop and have a client who wants a large quantity of shirts. The client has a very broken phone line so communication is tough. He agreed to the price right away and wanted to pay in full right away. I didnt have a merchant account so im setting one up which is taking longer than I thought. He wants 2000 shirts by wednesday. He sent two credit card numbers and info for billing. He didnt want to see a proof of the shirts, didnt negotioate the price, says hes in Tangier, has an address in Id, and ordered the shirts in Houston Tx, says hell have someone pick them up. I guess it would be no problem if i had been able to process the card right away. The fact that he prepaid seems legit but what kind of scams can he be running. He emailed me to go ahead and print without sending him a proof of the shirt so if he tries to say that its not what he wanted then I have that. The other thing is he's in a rush right before a holliday, seems fishy but its good $