Check to see if report data for a date already was imported - ACCESS 2003

I have an import process that, while the users aer suppoed to run every day, they may run i tonly once for three days.  I need to check each time the upload is done if it has already been imported.  Not too much of a problem if they stick to the schedule of everyday, but the don't.  So, what would be a quick way to check a temp table data that has been uploaded for, say, three day's worth of inforamtion again the permanent table to be sure none of the days (if any) have not already been brought in?  that is someone could have imported 8/15 data, not told anyone and the next person imports data for 8/15, 8/16 and 8/17?  I would need to inform the user of the duplication data information (should that be another questions?)  This is an ACCESS 2003 database pulling information from a text file.

Sandra