I'm here to help you today so you'll be able to handle your checks in QuickBooks Desktop (QBDT).
If these checks don't affect your bank balance, then, you can simply void the checks from QuickBooks. To void the checks successfully, open each check, click on the drop-down arrow under Delete, then select Void. If you can't locate the checks, you may pull up a report and open the checks from there.
Click on Reports.
Select Custom Reports.
Click on Transaction Detail.
Customize the date.
Filter the transactions to Check and open the checks from there.
You can see attached screenshots for additional reference.
Please feel free to add a post/comment below if you have any other QuickBooks or check concerns, I'll be always here to help you. Wishing you the best!