I got one open (the tampered with one). No money, just a single token. Least I have something to play with.
Attached a power cord and pluged it in, awesome fireball and blown fuse. Before the big flash from the fuse (maybe whatever was shorting), heard music and saw colored lights, wheels spun briefly. This all happened in a second or less, what a thrill...
Inside, there is writing in english, and some stuff labeled in chinese/japanese. The blown fuse is marked 250V 10 amps, need to hunt through some junk for a replacement. Have some 10 amp automotive fuses handy, but not sure they will work. Need to find the fault first anyway, work on it tomorrow.
There is a key switch inside labeled ON/Reset, hope that isn't part of the fault. Seems like everything starting up at power up would be a huge power draw, but then again would it blow a fuse everytime there is a power failure...
Hope they all have similar latch mechanisms, it was really easy to slip with a screwdriver. Haven't tried the other two, but should open with minimal effort.