Posted 12/31/2016 4:42 PM (GMT -5)
It may be possible that something feels "loose" inside, but highly unlikely that it would be a staple. If there were internal staples left in his body, the doc would have to open the incision again to remove them. There are absorbable sutures, but I've never heard of staples that can be absorbed.
If he has an internal suture that is coming loose, it would depend upon where it is. It could heal just fine, it could be a problem, maybe from lifting.
Worth a call to the doc, maybe another visit, just to be safe.