If "a cool place" means at room temperature that never got that hot, I wouldn't hold out much hope for it for "correctable" pix.
Shoot one pic with each. Make sure the Velveeta is shot in daylight or flash and the 64 tungsten is shot in tungsten light. See what happens. It is all you can do to find out for sure.
Overexposing and pulling expired transparency film will only exacerbate the problems it will have from old age. If you test it and it lacks punch in the blacks, simply use it for pix in which you don't want punchy blacks. You can't print through fog to bring it back down to black like you can with a negative film.