As far as I know, all your theories are wrong. Though Lance is right in that Celchu and Tenloss owns them.
A number of ship wrecks existed in the game prior to the release of recycling. This was from red scenarios and whatnot. They were all of the default space debris "Wreck" ship type (all 50k tons, 50 meters or whatever.) When recycling was released, they decided to make it so that a wreck is not so much general debris, but a ship reduced to debris, such as A-wing wreck, SSD wreck and so on.
Generic wrecks were then randomly converted to wrecks of various ship types. Owning and leading StormOne Recycling at the time, I recall we had at least one MC-80B and several Lucres. Tenloss ended up with several SSDs and all sorts of stuff. Occasionally (depending on wreck damage extent, I believe) you are able to enter wrecks you own, hence why you might occasionally see Tenloss make GNS posts from a SSD.
I seem to recall that Tenloss had a large number of wrecks, but since then they may have created more by using the wrecker ship that can split wrecks in to additional smaller pieces of size determined by the pilot. I don't think anyone was allowed to keep testing wrecks. At least I wasn't, and had to make them over to BlackKnight again after testing.