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so I'm looking at these sust bottles, it's organon 250 and I noticed one of the 10 bottles had more fluid in it than the others. then I examined them closer and at the neck they have little ridges. I opened a diffrent brand once and thye didnt look like that, the neck was smooth and I had to cut it with a knife to create the ridges and then snap it off. do I make any sense can these be fake? I read there are virtually no fake sust. 
