Packing and moving stuff out of what is now somebody else' house. Where did all this stuff come from?

Clothes I haven't worn in years, coffee mugs by the dozen received as gifts that I never use, articles in folders that were important for some now-lost reason, knicknacks that seemed interesting or cute but not enough to pack or move, ball caps from events by the dozen in a pile on a closet shelf, recepts and tax records more than a decade old carefully filed away, old computer software and diskettes that could only run on museum piece equipment if at all, cheap lamps and appliances that I could probably rewire someday except even fixed they are junk, good parts from otherwise broken stuff, etcetera.

Am I the only member of the it-might-come-in-handy-someday club?