As a matter of fact, there is only one fruitcake, and it keeps getting re-gifted.
My brother and I are going on 30 years refitting the same cheap fruitcake.
You are almost correct. There were actually 100 fruitcakes made in the 1800s, and they have been passed around as “new” gifts at Christmas ever since. Records of these fruitcakes have been passed around the world by experts in the field and a clear chain of possession has been maintained except for one.
This one just found must be the fabled ‘missing fruitcake” that fanciers have been searching for during lo these many decades. If it is in the original tin and uneaten, it is worth a lot of money.