Secret Cereal Box

this is a secret cereal box

You need a empty cereal box, a bag to put in the box, a pebble like subsistence to match the cereal's weight, and an envelope to hold the money.

Get your cereal box and put the envelope in

Next Get your pebble like substance and put in your cereal bag. DON'T USE REAL CEREAL!!!

And finally put your cereal bag full of pebbles and put it over the envelope in the box and close it.