How do you feel about the Topps Vault negatives?

[steve B]

I like them, and pretty much any other preproduction stuff as well.

But like Exhibitman said the film is a tricky medium.
Nearly all Kodak film from mid 50's -1982-3 will eventually discolor. Typically the image turns red/pink. Some goes quicker, some slower but it all turns.
The exception for these might be any done in Kodachrome, which is dye based and doesn't show much fading. Some of the early 80's stuff also fades, but very slowly. Ektachrome shows image density loss beginning at around 20 years.
Other films have the same issues but are a bit more colorfast. Fuji gets a bit purplish, but fairly slowly.

And it's not just negatives and transparencies. It's all kodacolor from 50's -80's including prints. And many other print papers. (And some stuff was done in B+W on color stock and also turns)

True B+W should last a very long time depending on care and how well the original developing was done.

Steve B