Those are my litmus tests for whether or not I'm dealing with a hoarder. (ducking)
So anybody who wants the misc stuff that makes the machine actually useful would be a hoarder (keyboards, mice, printer, scanner, monitor, cables for all that, and original software)?
I have over 100 computers (if you count laptops), 4 laser printers (3 are vintage), 2 scanners (1 USB and one SCSI which I purchased new back in the 90's), a few dot matrix printers, boxes of cables (mostly breakout cables for video editing cards and they tend to be pretty long), and lots of boxed software plus misc disks.
When some people offer up lots of all or nothing stuff without pictures you have no idea if they are cleaning their basement and expect you to bring a semi truck and take it all just to get that Commodore 128 you do want. There have been a few times where people were offering stuff I had to take a few things I didn't want or need and then I have to either junk, give away, or sell it off. Personally I don't need any off brand CRT monitors, misc barely legible home made moldy floppies. hacked cables I will never know what they go to let alone use, or anything too dirty or infested that I am afraid to touch (dust I can live with).
Hoarders never throw away anything even if it is trashed, non working, and they have working copies of. They also tend to just toss things in piles and never touch them again.
I know a few people who snag hoards of old PCs and they let me take what I want with the knowledge that if I want something out of a tower I have to take the whole thing and dispose of the unwanted stuff. Generally all of it would end up at the dump (they snag the newer stuff) so I don't mind raiding a computer missing a front face or door for a nice aftermarket heatsink, maybe a CPU+ motherboard I want, or just a nice graphics card and junk the rest. Last Thursday I tossed a nice looking Thermaltake mid tower because it came without the front face plastics and I already have a test stand case (NZXT Whisper EATX full tower in mint condition minus the door panel) so I took the motherboard and tossed the rest.