I'm confused, it looks to me that coins 1-9 were sold to 3 or 4 people. And #10 was given away to someone. So the reward will be taken by those 3-5 people who purchased the coins. Don't really seem random but more staged to those few people. . . Any of these coins for sale?
It is like a reward for purchusing his product it doesn't have to be random. If it is real they will probably look to the community to help solve the mystery.