I just received mine.
Great keyboard, it cost me 15 euros + shipping.
Indeed, the label says g80-1861HAF. It's more dark grey than black.
A shipment with insurance of 150 euros from France to Germany cost 18.65 euros (2 kg). It's rather odd that he asked you 30 euros, not very honest...
btw, I doubt that the seller doesn't have you sent the keyboard with 762 100% positive transactions.