Everyone stores their gold coins in ? Blocks but that also means everyone known thats where the gold is at. Hide your coins better by placing them in a regular brick and hide in plain sight.
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So this should be a simple print as long as you have decent bridging on your printer.
You should not need any support material at all for this, as long as you print the lid upside down. (opening up)
After the 2 parts are printed it should just fit, you may require some light sanding if your tolerances are not tight enough.
For mine I airbrushed both pieces with an acrylic red oxide paint, then hand painted the spaces in between in acrylic black.