LOL! if their company is THAT big, tell them you will only use L/C as payment, and you want an SGS inspector to verify stock first. Alternatively, tell them you want to do a fly and buy.
Also ask for their bank details, tell them you will call up the bank and talk about their company and their standing...
Also ask for trade references and company registration details
I'm 99.99999% sure they sound like scammers
Anyway, in all, i'd say, when u do ask those questions i mentioned above, you'll never back from them. and then write off this *#*&^$ as a scammer. (go ahead and make a post about them in the name and shame section

just start a new thread there and put down the name of the company)
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and now for the whammer
even if u put his address but not his name, he can still pick up the money anyway. the reason he asked for a scan of the receipt is because all he needs is the Money Transfer Protocol Number. He'll take that number to the nearest WU agent and then cash the money.
Hope it helps