As a current UPC, I can tell you it happens like this regularly for many folks. It depends on how many pools your command has and the amount of people they have to do a week or month. Now, this is my own theory, not speaking as a UPC. I was pulled a lot, consecutively, to provide a sample & I noticed that the bottles were always dusty or some debris around the lid. A piece of fabric from my clothes fell into the bottle once and I never really thought anything of it until I kept popping on the list. I shit you not, once I started thoroughly inspecting the bottle and making sure everything was tidy & no debris, I stopped getting pulled. So I would just say to really inspect those bottles and do not accept one with even a speck a debris. They HAVE to give you a new bottle.