If you empty the cat it is worth nothing.
its not rocket science, just beat on it till its not there any more (from the inside with the aforementioned broom handle or other hard, long object. It can be difficult to break down. *edit* for clarification, the best way to ensure everything is gone is to have the cat completely removed from the vehicle where you can dump
Also you will likely get a dtc for catalyst operation. There are options but I am on the side of the market that fixes these problems, not the side that jury rigs them. You do have options to try, google is your friend