Typically QBs will change the amount to $0.0 and add "VOID:" to the Memo field.
So you can search the Company File (upper right when you open QBs) and search for VOID. Depending upon what comes up, you may then want to click on Transactions and then Checks.
The other way is to just change your Checking Sort by (lower left in the Checking Register) to Largest First and scroll up to the $0 checks. You might need to do this if you made a note in the Memo Field and deleted the "VOID" that was there.
