When you changed banks, did you set up a new bank account in the Chart of Accounts? If so, then you should be able to choose that account when viewing the check register report, and it should only show the check numbers from that particular account. You can also put in the date range of checks that you want to view.
Also, when viewing the check register report, make sure that you don't have All Accounts chosen.
If you were printing the check register after printing checks during the Print Checks Confirmation, and it was including all past check numbers also, then that leads me to believe that the previous check numbers were not marked as printed? Let me know if this is not how you were printing the check register.
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