I do a lot buying from different sources and different parts of the country. I almost allways see issues with angenieux, steinheil and some older leica lenes.
Because...............over the years they have been under many different owners and stored in many different conditions. Ipso facto they will exhibit many traditional problems if any one of those owners has unwittingly started the deciline. UV light is the best thing for older lenses, not a drawer.