[lawls]

Did not read the article, but my lay perspective is that the chemicals will degrade over time into different molecules due to particle radiation from neutrinos and the like. Just given enough time, the original product no longer has any potent chemical effect.

[quantified]

Right. But I don't think we're concerned about whether an archaeologist from 50,000 years from now can take them. A 3-10 year window is too short for such radiation to have an effect.