Hopefully, they were 'used' and property of the training facility. While they should use PFD's that are maintained to standard, maybe they have huge numbers lying around that have been affected by salt and time...sound weak but I can't imagine a failure rate like that. I know that I am going to 'test' mine and while I only have 4 if one fails, they're gone. Thanks for the post!
My formula for living is quite simple. I get up in the morning and I go to bed at night. In between, I occupy myself as best I can.