There are still quite a few Sprague cars preserved and maintained by various entities, some of them are even inserted in the traffic for special occasions like "Les journées du Patrimoine" during which the RATP ans other organisations show off a lot of very interesting and usually hidden stuff.

That particular train of Spragues, the one that is covered with paint, has been stored in many places over the years, without a clear intent as to its future, like the BOA prototype. The first time I saw it was in the Vaugirard yard, which wasn't exactly a walk-in, so that made it a hard target compared to the regular trains. When they moved it in the connexion between lines 7 and 10 it became a much easier target and a go-to place for just about everyone.

I'm afraid the RATP doesn't care much about that specific train.

As for types, yes, we have all of them. Very few of us care about historical importance but it might actually be more of an attractor than a detractor for those who do.