The people working the yard didnt have the history on this surplus item but I am sure the management does. I will ask them to pull the documentation. They are usually pretty good at recording history of stuff.
Very likely that they are unused surplus, much stuff there is, but I guess that would be the question and for sure a matter of trust. They look unused. Brand new in fact, not a scratch. Still doesn't mean that they were not used as job site toilets somwhere along the way.