Hi kchris10,
Thanks for getting back to me here. My apologies for providing information for QuickBooks Online. In QuickBooks Desktop you can run the Audit Trail report and apply filters to locate specific information. Simply select Reports on the top menu and choose Account & Taxes from the list followed by Audit Trail. If you need to review user roles and permissions, click here. In addition, when a change is made to the price of an item, it won't affect existing transactions as noted in this guide for adding, editing and deleting items in QuickBooks Desktop.
For additional assistance and recommendations on how to prevent unauthorized changes, please feel free to contact us so we can work with you directly and look further into this from our end.
All the best!
