1) Go to School view.
2) Click on the Admin top tab.
3) Click on the Logs side tab.
4) Click on the thumbtack icon to bring up your filter menu, and select "All Records".
5) Click into the publish record for your report cards.
6) Click on the sub-tab Recipients.
7) The "Retrieved" column will tell you whether the report card file has been downloaded.
You can also select "Report Not Retrieved" or "Report Retrieved" on the filter menu for your convenience.