Why Did Elon Musk Go After Bunkers Full of Seeds?

[MiHale]

29. Can't really answer that the way it was asked ...

Not from anything official…to be able to replace a seed, one must first grow the plant to maturity, collect the ‘new’ seeds…then the fresh seeds are the replacement.
There is probably a farm of some sort to accomplish this. Timing of replacements would be, more than likely, based on the historical viability of the specific plants seeds. I have stored seeds and had them germinate for as long as 6 years. We have a dedicated place in a refrigerator for storage. The 6 year seeds were a forgotten package that was found and tried as an experiment…they grew.