Question: Make a hidden treasure box for fun and collect coins in it.
Options:
You can also use jewelrs hinges and screw them to finished product so you can open and close the box.
Buy a large chopping block and take a router with a deep boring bit and cut out a large pocket are in the block.Then use a thinner cutting block and cut it down  to sie to make the lid for it.
Answer: Buy a large chopping block and take a router with a deep boring bit and cut out a large pocket are in the block.Then use a thinner cutting block and cut it down  to sie to make the lid for it.