@mk1 on the Processor screen you can use the fields to create a one-off query. You can do a search for Approval Status Equals Paid. When the results show, click on one of the reports to open it. Once opened, you click on an expense to view the details, including the receipt. Depending on which User Interface you are using, viewing the receipt will be a little different. In our Legacy UI, you should see a little blue check mark on the line items that have a receipt attached. You can mouse over this to view the receipt. You can also click the line item to display the details. You should see at the top of the details two tabs, one of which says Receipt.
In our newer UI, just click on an expense entry to open it. On the right of the expense details, you should see the receipt.