By default the Job Grids only show Job data for the last 90 days. Any Job data before this date is archived which can be retrieved using the search filters. This default archiving makes it faster for you to retrieve your Job data.
You can find any Job data before this date by simply selecting the calendar icon on the the "From" and "To" search filters and use the date picker to select your time frame. Once you have selected your dates the search results will automatically generate.