Reconciling means recognizing every transaction that cleared the bank account. If the CPA deleted 60K of transactions, they most likely never cleared the bank and since that's the case why were they in QBO? Do they belong to a different bank account or are they credit card transactions? If so, you need to add additional bank/CC accounts to your books. If not, then what were they, doubled transactions? Fake transactions? Paid by the owner personally? The point is, you can't reconcile transactions that didn't go through your business account.
Figure out where the 60K of transactions came from and take the next steps.
Hope this helps.