Well, I would trade it, but I wonder, for what? If he is quitting probably he won't need any PSO stuff, so maybe it should be the best way to really quit PSO. Or maybe he can give his stuff to a GM so that GM can make maybe a mini-event with these items? Idk
I say if it's a quitting decision if it were me I would take all my hard work and hours to my grave. There's no getting that time back. At least I'll have something to look back to.