No problem in being critical of potential scams, but at least get the math right...

144 blocks day @ 25 BTC block= max $154.800 @ $USD 43 BTC per day is being earned by mining

and that is if he has the total network  output, so with 'only' 40 TH (500 x 80 GH) he would get about half that each day.

Besides, I doubt his apartment has 500 x 800 W= 400 kW worth of infrastructure (not forgetting cooling)

edit: updated BTC price

+1 Please keep us posted. Great community effort thanks.

How come you are protected by paypal? did you order from a site that has a specific paypal protection disclaimer, or do you have an invoice from a trader that has some paypal approval, or did you just sent money to another paypal user? I'm very interested about how your deal was made exactly.

I received an email giving a payment adress and paid to this address. I checked with paypal and it is covered (maybe this is different in other countries?)

Yeah Paypal Buyer Protection applies if he paid and market it as a payment for a purchase. He has 45 days to open a dispute. If the seller asked him to mark it as "gift" and he complied, then he's been ripped off.
It's not like nobody has ever paid for a computer with PayPal before. They'll be able to understand. This is what they call "item not as described". I.e. you get a brick, radiator or a Pentium III instead of a bitcoin ASIC. But good luck with getting a refund if it doesn't make as much money as you think you would. That isn't covered.

Well, that's what I said. You get a nice radiator full of chips that gives you 0.00000 Mhashes. Good luck explaining that to paypal.

Item not as described... item not even close to described. Seller claims it does a certain function at a certain speed, it doesn't.

Dear Paypal,
Item does not produce the promised amount of the irreversible virtual currency thats set out to destroy Paypal.
please reverse transaction.
thx.

That's way we will see scammers offering ASIC miners. They know there will be anxious, greedy people willing to believe that scammers will be able to fulfill their promises, even if their offer is ridiculously full of red flags. It's like the bitswing.com guys offering BTCS at 21$.

If it was someone from the forum, who is and established member with 500+ posts, then sure go for it, paypal, moneygram, btc, iban/sepa doesnt matter... But someone dropping out of the sky, with the offer thats too good to be true. .... For large amounts of money i mostly like iba/sepa/bank transfer - 99.5% cant open that with fake credentials