I used to but since it's almot all available on-line now, I am throwing some away, although I usually keep the manuals for higher dollar items like cameras.
Manuals and boxes for all but the cheapest and simplest stuff. Even though a lot of manuals are obsolesced as soon as the next firmware revision comes out on cameras and audio gear. I'm part pack-rat, by-the-way.
I bet if I looked, I could find the manual for my Betacam...
Yes I do. And keep the boxes for a couple years or so....longer if it's expensive and I think I might sell it.
Still have some manuals for stuff 17 years old.
Ironically the last piece of gear I sold - a new Tascam - I had tossed the box, so I couldn't include it! :/
And accidentally threw away the manual for my FS700R that I still use. What a dork I is
I currently don't have the storage space to keep the boxes, so they get tossed immediately after I confirm no damage to the item. I keep all original manuals and for some items, as well as some software, I download and print out the manual and keep it in a 3-ring binder. Much more readable and I can add my own notes.
I have a filing cabinet full of manuals, sales receipts, warranty documents and manufacturer's promo literature for every piece of equipment I've owned and even some I've just lusted for over the years. When I sell or discard a piece of equipment, the paperwork goes with it.
I also mostly keep the original boxes, at least for expensive items (defined as roughly $1000 or more). Please don't let the fire inspector go up in my attic.
I also keep PDF files of manuals for as much of my current equipment as possible on the laptop that I take with me on shoots. Just in case.