Is there a way to identify the transactions that were swept from last month?
Please check the "the Unaccounted Transactions Sweep" program that was run during the close process which will give you details about the transactions that were swept during that month.
I checked it there but could not find invoices.. is there any query available through which I can identify?
I dont think there are any references....but the unaccounted transaction sweep report should list those invoices. But If you cannot find any, please refer to previous months report too...
Pradeep's answer is the best my to identify sweeps. You can also look for invoices with GL date of the first day of the 'sweep to' month as this is where AP will assign the new GL date.