Many older Mint Sets that have not been properly handled have a multitude of small nicks and cuts on the mylar wrapper. These are usually lesser quality sets due to the mishandling and the coins will sometimes develop spotty toning from the exposure of the holes. Trying to unseal and reseal the mylar is more trouble than its worth(not to mention very difficult) because it is heat sealed. I doubt if someone tried switching coins but it does sound like you were the recipient of someones cull Mint Sets.


















