Yes, indeed. As Jakuje mentioned this is already answered in: https://project-gc.com/qa/?qa=12310/deleting-archived-caches-from-virtual-gps&show=12310#q12310
The answer is to scroll to the right and find the "Last Archived" column and click the column header to sort by that header.
You can then easily check the first archived cache and scroll to find the last one. Then you should Control-Click the last one. That should select all of the archived caches and you can select Delete.
I still think it would be nice to have those options on the Mange button, but this is a very workable work-around.