I imagine it could have been less than $6 million/year if the state was willing and able to recertify the equipment in the same way the DoD does with medications.

https://archive.defense.gov/news/newsarticle.aspx?id=44979

I think state and federal government should work together to create and fund independent state/federal agencies to handle the storage, handling, and certification of stockpiled goods. It'd probably pay for itself fairly quickly.

Edit - That could be a problem for many politicians. I imagine a lot of pork comes from replacing expensive equipment and supplies.