If you have missing sales for items that have already been paid for, or need to update previously downloaded sales (to update refund information, etc), you just need to reset the download duration and click to download your sales again.
-Open MyCostPro and go to the Account Information tab
-Change the number of days to cover the range you want to re-check (up to 90 days)
-Click the 'Reset Duration' button
-Go back to the Sold Items tab and re-run your query