The government probably spent a pile of money to buy them, they likely traveled around the world a few times, were sold as surplus for pennies on the dollar, and now they're living out the rest of their lives as almost perfectly designed indestructible cattle feed troughs.
It might be me, but I kind of like stuff like that.
Even though I don't really use feed troughs very often, if I ever found some for sale I'd like to buy some for myself. If I was going into the cattle feed trough building and selling business, I'd think long and hard about using the same sort of design, although I don't know if they'd be as interesting without the back story that military surplus bomb shipping containers would have.
|"Bombproof" Feed Trough|
|Upside-down "Bombproof" Feed Trough|
|Shipping & Storage Container, Bomb Dispenser: XM 468|