Speaking from past personal experience, most of the used car parts I observed on the shelf were fully depreciated: brake discs worn down to almost nothing with runout you could visually observe, suspension components clearly used well beyond end-of-life, rusted-out brackets, etc. Toss in the fact that they were often inconveniently heavy or ridiculously specialized (i.e. like-new stock mufflers for a 2015+ Subraru Impreza WRX STI - not compatible with lesser Impreza trims), turnover principally happened whenever a volunteer such as myself hauled them down to the dumpster.
But with a new committee eager to revitalize the freebie shelf dedicated to running it better, they can update the rules with BoD approval.
No longer my circus and definitely no longer my monkeys.