From gizmodo.com

He additionally cautioned that mishandling the crate of grenades could result in them performing their intended function at an unintended time. Mountrail County Sheriff Kenneth G. Halvorson added in another statement to the Post that attempting to fire the rounds out of anything other than an MK 19 automatic grenade launcher could result in “catastrophic failure,” so also don’t do that.

https://gizmodo.com/the-air-force-would-appreciate-some-help-finding-a-box-1826056964