Earlier quoted context omitted.
This. It's what any minimally civilized adult does in any context, to respect someone else's efforts or valuables regardless if a thing is valuable to yourself. At least enough to try to give it back. At least enough to warn "hey, I'm just going throw this away". It sounds like what happened here is individual turnover, where the entity that accepted the material is not the same entity that discarded the material. It…
Yes, they should have tried to give it back or, ideally, just not accepted in the first place absent a concrete plan. And, yes, it's worth understanding that not everyone (including university archives as well as volunteer organizations) has the level of enthusiasm about donated physical "stuff" as you do even when you think they really should for whatever reason. However, as someone involved in an archiving project…
My mom couldn't care less about computers and she called me to ask if I wanted to keep some floppy disks before she threw them out.