5.x manuals - should I toss them?

System

I'm kind of a packrat. We are running TeamSite 6.5 and OpenDeploy 6.0.2. I have the 6.x documentaton downloaded and use them regularly.

However, I still have my old 5.x hardcopy manuals sitting around my desk, as well as the old 5.x installation software.

Looking for an opinion. Should I keep the old stuff, or should I recycle/toss them?