Well I have ADHD so I lost the receipt without realizing it, and then forgot that I didn’t get rid of it.

Or don’t create it. You don’t need invoicing or books for an illegal business. Just have a rough idea of what your going to make and make sure you’re close at the end of the month. Bookkeeping is just evidence for the prosecution. Its their job to figure out how long you’ve been in the game. The less they know the better your parole.