Wait...did you get refunded the 8,000 USD equivalent in Bitcoins or did they "literally" give you back the same coins you paid with at the time?
If it is the latter, then you sir have just [possibly] opened Pandoras box.
I thought that Bitcoin payments for BFL products went through Bit-Pay and that BFL received the payments in USD - which would mean they couldn't refund "your" Bitcoins because they never received your payment in BTC in the first place.