I just wedge a pointy knife into the side and wiggle it around. That breaks the seal and then you can move the knife around the edges to finish it off. I recommend using a microfiber cloth or similar to gently pop the coins onto.
I have a big tool that is like a large pair of pliers - more like shears - with a hammerhead that has a sharp edge. I don't know what this tool is called, but I bought it on ebay where it was called, fittingly, a "slab cracker."
I use both a dremel tool and a pair of whatyoucallems that stephen described because my wife doesn't like the smell that the dremel makes when melting the plastic and I got mine from home depot for about 5 bucks if I remember correctly
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