IMO, CipSoft will not punish You for being gifted Tibia coins if u didn't take part in any bad accident with Tibia coins. I think they have more options to check which persons has made some black buisnesses with these Tibia coins then "History" of these coins, i mean they probably check IP's of internet provider and some details of our PC's. But still i think its safer to send back these coins. Anyway, they have been bought by real cash, we should send them back. They might be sent by a mistake/missclick/missunderstood.
Back to the punishing for it, if it would work like this, i mean "these coins were stolen from our shop/payment for these coins was taken back, we must punish them" would make those thiefs sending these coins to everyone just to make them banned/deleted for fun.
IMO its impossible to ban/delete peoples for being gifted ^^
It is just my OPINION, thats why it is comment ^^