Looks like one of the cardboard puzzle / model kits. I'd try Hobby Lobbys website or some of the bigger hobby shops. I remember seeing one of the White House that was paper bonded to thin wood. Looked impressive in the glass case.
for me, it looks like some sort of metal puzzles that slide into each other. there is US engraved on each so I assume they are made in the USA. somebody must know what they are
Thanks for all the replies.