How do I reconcile uncleared transactions from previous years?

My account is current and balanced. I think most of these uncleared transactions are from a previous bank account. The previous bank account - let's call it BankA, has a list of a few uncleared transactions from almost 6-7 years ago. That is when the church started in with a new bank, let's call it BankB. Interestingly, the transfer of funds from BankA to BankB is not correct either. The last balance from BankA was $10,101.00 (+/-) and the opening balance of BankB $15,000.00.

My goal is to clean up the outstanding uncleared transactions so when I reconcile, I don't have these transactions permanently uncleared for all eternity. How do I resolve a situation like this appropriately. My plan is to go back and try to find the old 2014 records and see if I can reconcile them, but that is probably not likely.

Any suggestions would be welcome! If you need more details just let me know.