evidence of second hand device.

My daughter's i-phone 5C screen cracked. While by-passing a retail shop, for convenience and fast reinstatement, I got the screen replaced in the shop. Upon completion, the technician asked if the cell phone was a second hand or had been repaired before. Answer of both question is "No". The technician then show me the cracked screen taken out, there was a stamp chop on the underside of it and he said that's the stamp of the previous repair dealer shop. He thus quoted that was the evidence the cell phone was a second hand or had been repaired before.

I wonder if a brand new i-phone got a stamp chop underneath the glass screen, i.e. was the technician telling truth?