Buff,
Have you tried putting a coin into a jar, quart mayonaise, something like that and shaking it around? Sometimes that hits it just right so it will pop open. This works some of the time, but I still have some that have circulated so much they are dinged on the edge and will not open.
Have you found both types of magicians coins? One has the foreign coin on the inside and the other has the quarter and the dime inside.
I dont know anyone that collects them. I keep them because I find them and they are different. Sometimes if I like a teller I will show them one and if they really show an interest give it to them as a good will token.
CLZ in TX