You use the account Statement. You only mark as cleared anything the Bank also processed and is on that statement. If they are not on the March statement, you Ignore them. If they are not on the April statement, you Ignore them. If they show on the May statement, you mark them as Cleared, because the reconciliation process is you Verifying, Yep! I see on the statement and in the bookkeeping that the exact same activity, for that same value, has been entered and have been Verified through the bank as being processed.