Don't buy bolle or any other safety gear from eBay. You have no way to ensure they are not counterfeit. I just bought some bolle silium for non skirmish shooting, they arrived in a cheap polythene bag, no cloth bag, poorly painted frames, non polished lense edges and they got the safety markings wrong on the lense. They are clearly counterfeit, when you place them next to my genuine trackers.
Buy glasses from legit retailers and places that you can verify. You only have one set of eyes, don't fluff them up for the sake of saving £5.