Yup the guys are right, rather just replace it or find out where the car was serviced and they can check if it was changed or not. I am on 161 000km now and changed mine too, the new belt is very solid and you could see wear and tear on it after i had removed it.
Dont take a chance dude, rather change it!
2004 Ford Focus ST170 MoonDust Silver Newskool
1987 Ford Sierra 3.0 GLX Black Metallic Pearl Oldskool
1974 VW Beetle Metallic Purple Rocking a Roofrack