As far as I’m aware you can select more than one file, see image example of some file samples I have in the chest and select Restore. Select the first file scroll to the last and Press the Shift key and hold, then click the last file.

However with 8000 I don’t know if you can just highlight the first and do the old Ctrl+A (select all) trick to select all. Obviously you have to ensure that you don’t restore any files that were in the chest before today. Or ones that weren’t for this -inf detection.

You can order the files in the chest by clicking on the relevant column heading, either the Transfer tine or Virus column, this should make sure that only the correct files would be restored.

One other consideration is, why bother restoring any files back to the temp internet files folder, as temp files that would be absolutely pointless, only files outside of this location should be considered for restoration. So you could order the files in the chest by clicking on the Original location and even delete all those from the temp internet files location directly from the chest.

That should greatly reduce the numbers you are talking about.