Surely they still exist. One would hope so anyway.
Maybe in someones shed, or now in someones home. Maybe even in the Museums storage, out of site, out of mind.
You'd be amazed at what is hidden away in Museums storage rooms. Our city Museum of ART & history, is mainly all arty stuff, with all the historical stuff. records, photos and artifacts, including models, all hidden away in locked storage rooms in the basement. Old record books not computerized so "unknown" to most staff who look it up on the computer, don't see it and tell you haven't got it, even though you have been told by the family which donated the collection to the museum and what year it was donated. Its there, but in the old catalogue system, so doesn't EXIST as far as they are concerned.
Rant over.
Hope you have better luck in finding some of these very precious artifacts
cheers
vnkiwi