The first thing to determine is what emulation pods it has and if it is the tape or floppy diskette version.
The 64000 had many, many, internal options as well.
Honestly, old development systems like that aren't worth very much today.
Certainly noting near what they sold for originally
I would expect the shipping cost to actually be the long pole. For the processors it supports however, what it can do almost invisibly and in real-time is often unmatched, or even impossible for JTAG and software based debuggers. E.g. non-intrusive true real-time SW performance analysis on running systems.
An HP64000 mainframe by itself dosen't do anything. If you aren't working on a project using one of the processors it supports or just need a logic analyzer then it's a boat anchor. The emulator/analyser/prom programmer cards installed into it and the pods that connect to the target system are what make it useful. They all require software, of course, either on floppy or a supported HP hard drive (or an HP hard drive emulator). That's pretty readily available (E.g.
https://bitsavers.computerhistory.org/bits/HP/64000 ).
So, if you haven't unloaded it yet, as Al said, see if it has a cartridge tape or 5" floppy on the front panel to the right of the CRT. If the front panel is blank then it will only boot from an external HPIB disk drive. Add the list of installed cards, external pods cabled to the cards, and the mainframe serial number to your posting so folks will know what it is configured to do. Also, look on the back of the mainframe to see if it's marked as having a 300 or 400 watt power supply. If you don't find any marking then it has the original 250 watt supply.
Finally, pliug it in and try to turn it on. If the screen shows it's trying to boot then the mainframe at least is probably OK. If the screen is blank and it just beeps then it probably busted. If it give a halfhearted beep (or nothing ) then it's a brick. Back then, however, repairing bricks was usually possible.
