Replica/Counterfeit coins

I am concernd that replica or counterfeit coins can be traded on trade me. Many of these 'coins' are gold replicas and although the seller may say the item is a replica the word 'Replica' or 'Copy' is not stamped on the 'coin'. Once the item has been purchased I can't see that there would be restrictions on the purchaser reselling the item as a genuine 'coin'. In reality it appears that Trade Me allows the trading of potential counterfeits and conterfeit coins are illegal. It is concerning that many of the replicas are  gold 'coins' that a possible buyer could be fooled by.
I understand the term caveat emptor and its meaning.
I feel if a coin is sold as a replica but does not have 'replica' or 'copy' clearly stamped on its body it may effectively be counterfeit.
I'm not complaining, I am just interested.
Craig 

Edited in line with Community guidelines