Question Mark Mystery Prize Block Money Box

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An original Question Mark Money Box, with a few key features of distinction: 

1. Coin slot big enough to fit even a large coins, like the Australian 50c piece.
2. No supports required.
3. No gluing required; the question mark elements will pop into their cavities and stay in place forever.
4. 12cm x 12cm x 12cm in size
5. A sliding bottom panel with interlock (because trying to pull notes/bills out of a circular plug hole later is frustrating).
6. Question mark face will be the same texture as your print plate (e.g. textured or smooth depending on the finish you want)

Optionally, you can line the bottom with some adhesive foam sponge to prevent the plastic base from sliding on hard surfaces.