https://bitcointalksearch.org/topic/beware-of-fake-casascius-coins-3257048
No problem. It looks like that very same type of replica coin was sold at this auction
https://www.ebay.com/itm/2011-Bitcoin-Gold-Plated-Physical-Bitcoin/302622851700?hash=item4675ba4274:g:TeQAAOSwoPpaX8lq
The buyer probably turned around and posted it as genuine to scam inexperienced buyers.
These fakes are pretty well done IMO and only the most discerning of collectors can recognize it for what it is, a forgery.
In time someone will come out with even better replicas, and we have to be more vigilant.
I for one will be monitoring ebay for any new Casascius coins listed