This version has a screw-off bottom, so that the whole thing can be picked up without falling apart and plaster makes it of comparable weight to its original contents to fool those that pick it up.
Step 1: What you'll need
Plaster of Paris
Soup can or other type of can
Small(er) plastic jar with threaded lid (with label removed for mildew resistance)
Side-cutting Can Opener (did I mention it HAS to be a side-cutting type?)
Several hundred dollars in cash
Hungarian Vizsla (optional)
Step 2: Open bottom of can
Step 3: Clean the can
Step 5: Attaching the internal lid to the external lid
Stand the small container upside down on the metal lid and center the two lids as best as possible. You can slowly spin the metal lid around to see that the small lid is aligned along the same center point as the metal lid.
Let the epoxy dry until it can be handled.
Now the plastic jar should fit in the soup can.
Step 6: Adding the plaster
Pour the plaster of paris into the upside-down soup can then push the jar into the can and apply pressure so that the plaster makes good solid contact.
Wait until the plaster starts to set (2-4 mins) and unscrew the lid about a half to a full turn, then push down some more. This way when you screw down the metal lid in the future, it goes very snuggly in.
Let it sit for 20-30 minutes to solidify.