I don't understand why you seem to think that gov't stockpiles don't end up in the hands of government employees and medical professionals as they are intended to, or that the storage conditions of N95 by the gov't is any less suitable than commercial warehouses?

Unless these N95s are being stored in a bog, I have a hard time understanding how they're "turning brown" and "deteriorating" in the span of two years.

Such unlikely claims would need a source.