If it can be applied in a normal manner it is usable. (Like a new tube) Those dates are there to remove liability from the manufacturer so that ruined tubes can't be returned. Saves them a lot of money.
As far as Northwood quality, they most likely have written quality standards to produce the best product the company can. Some individuals cut corners because they could care less others are very quality minded. If they get caught it gets corrected.
The company may want to know what you found. They most likely won't be able to tell who performed the process. But, if it is a recurring issue they will probably implement something to correct it. Add a new inspection step. If they don't know about it they can't correct the process. Stirring the pot on here won't fix it.
