Years ago when I worked for the state museum system in Pennsylvania we were in Boalsburg doing a museum-wide inventory of the collections.
In moving a bunch of stuff in one of the storage buildings we found a large crate that had no accession markings, no inventory markings, no system markings of any kind on it.
When we opened it we found a Hotchkiss 37mm revolving cannon that apparently had been captured by the 28th Division during World War II and had been donated, along with literally tons of other arms, to the state museum system.
The only difference was that it had never been formally entered into the system. It had been parked in the storage building and forgotten.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.