I keep some things, but I'll clean up the junk and unused stuff.

It all depends on how old the stuff is and how big the organization is. If the company is under about 250-500 people, then you really don't need that much old stuff. You only need enough to support the people still using older equipment that haven't been up for rotation to new stuff.

When I find 300 old cables, the first thing I do is determine if we actively use them. If they're much older and not really used, I'll toss out all but 6. It keep the clutter down and makes organization easier. Then I look through and figure out if I need all 6 and toss out all but 2 or 3. 99.99% of the time I won't need them. I'm not keeping all that junk around to take up space. I have not been caught without spares after donating all that excess. I try to keep enough to handle what might possibly come up.

Cat 5 cables should all be gone, or you end up with problems on your Gig networks later on. Cat 5e and Cat 6 should be kept, at least for now. Some things must be thrown out completely while some things must be kept.

Hoarding doesn't have to be disorganized. Besides, donating it somewhere means that someone else can reuse them. During the old days, you'd go to the old IT/tech stores to find $1 or $2 cables and not the $20+ overpriced crap at the Worst Buy stores that exist now.

Same with equipment. When you hoard that, it means someone out there can't get a used computer, because you decided you can't part with 5-10 year old equipment. When I donate most of it, it'll go to someplace that will use it another 5-10 years, compared to them not having it. Keeping it in storage means it's unused all that time. I'll keep 1-5 units as backup until all our stock is rotated out, but I'm not going to keep all that junk around. That old stock will dwindle as users switch out to newer systems.

I rather free up the space for newer stuff and rotate out older stuff.