If you trust him good luck with that. I wouldn't do it unless TH switched over ownership. So TH will contact you instead, when they need your BTC address. That way no one will have any control over your boards. Not even considering you sending him 8 BTC and hoping he's honest.
fyi my paypal claim turns over to paypal tomorrow the 16th if terrahash does not respond to the claim.
if terrahash does not respond to either you or paypal then the deal is off, as presumably i will be getting a refund via paypal.
On mine TH never responded. Just a threatening email outside of paypal when i did claim. But nothing working within paypal. Hope you have better luck though.