Not sure you can tell but there may be clues. If you bought from a Ford dealer, maybe they flashed the truck which would remove the FICM tune? Ask for the Oasis report so you can tell. Next, a lot of guys (me included) got the FICM tune while getting the FICM repaired. Check the FICM to see if it has any identification of being repaired such as FICMrepair.com or Swamps. If there's no identification, then it could still have a tune, but it becomes less likely.
I don't know if you can tell electronically, I suspect not.