Find and void transactions

Hello!

Our tablets went down yesterday and in the process, when the staff pressed the “credit” button, it would glitch and hit the “cash” button. I now have their drawers as short by the phantom cash, and I need to find and void those transactions.

I am not finding the transactions through sales>order search, and am now trying query but not finding all the parameters I need. I can find user and date, but not payment type (cash). Then, is there a way to retroactively void the ghost transactions?

Any help is super appreciated.