Remove the a2b, and all the wiring and the switch, that looks pretty new. The rest of the stuff it depends on how much storage you have, and how long you want to sit on it, before the "just right" buyer comes along that needs what you have, and isn't going to just by new parts. Not only does it take a buyer that needs your parts, but he's going to have to find out that you have the parts.
I wouldn't try to pick it up with your forklift, its a long ways to the center of gravity from the side. Looks like the tires might all hold air, if you want to load it, I'd push the tires straight with your forklift, then pull or push it on the lowboy. If it won't run to pick up the outriggers, individually pick up each corner with your forklift while you cut off the jacks. disconnet the park brake, drop drivelines if the trans is holding you up, but I think the park brake will do it.
That said, it may have only lost a main hyd hose, just coming off the pump, from setting around. It looks really rough, but look at it this way, sometime in the last 2-3 years, they spent $3,000 putting that a2b on it, so it really probably isn't that far from being a running crane. You don't spend that kind of money unless you plan to use it some. It needs a new winch line and some paint, but the main part of the crane, everything looks pretty straight. All the pieces are there. There's no reason to pull the boom apart, if its not puking oil from the boom, there's no extend/retract cables in that style. And in the pictures, the boom looks dry.
Tires are all good, outriggers are all there, boom looks straight, I guess I'm seeing your yard crane for unloading while the other one is out in the field, or can you say "tandem pick".....
They actually got it running, so I'm betting you're only some hoses away from it working. For me I think I'd look it over a little before just deciding it's scrap, $400 in hoses might get you a second crane. $600 of painting would make it look a lot better. If it had been sitting for 10 years, they wouldn't even have batteries in it. It would be really similar in size to your grove.