@rwbs2021 The same way you usually do it.
If the bank account owner in question did not keep a proper written check register, you should still be able to access the relevant information through the bank's website, assuming said owner either has an online account, or is willing to have one set up for this purpose.
Most banks will have a history going back at least a few years. Just this past year, I was facing the same problem with a couple dozen bank accounts, and was able to see the activity all the way back to July 2021. Many of them will allow you to print statements as well, though the available time frame will vary.
At worst, if the expenses were not entered into QuickBooks through the years, you might miss out on checks that somehow weren't cashed for two and a half years. If the bank feed doesn't go back very far, and there are is no paper trail anywhere for you to find the events that went through the bank account, then you'd be better off asking your accountant about it, or begging the bank to show mercy if you are the accountant.
In my experience, bankers tend to have access to older records than they let on.
