Was wondering how they got hold of "Powdered Milk from 1952 Korean War Rations", but they even answer that!

  > COLLECTION LOCATION:
  > eBay, sold by littlebitoeverythingjoe

Amazing how meticulous they've been, right down to recording the conditions that the package was shipped in:

  > SHIPPED IN:
  > Original packaging inside Ziploc bag
  > 
  > SHIPPING METHOD:
  > UPS Overnight

https://www.plasticlist.org/product/37