Re-serve uneaten bread is NOT a safe serving technique because once an aliment has left the kitchen or the prep stations, you don't know what happened to them.
Although unlikely, the customers would have placed something in the bread. Bigger risk is that they just handled them with uncleaned hands spreading their germs all over. So, that bread cannot be considered safe to serve to a new client.
I would go over to them and help spot them. However, I am not very good at lifting weights so I feel that the next best thing is to call for help while you are attempting to spot them.
