From your statement that it's a DP with a 22" Cinema, I'm GUESSING you probably have a Gigabit Ethernet dual 450mhz or Dual 500mhz. I'd guess it's no later than a Digital Audio, for which the only factory dual config was dual 533mhz.
As
@eyoungren mentions, the 22" is probably the most valuable piece in and of itself. It's actually somewhat of an interesting piece to me-the price was eye-watering when new. I can't find the notes on it now, but I know it was well into 4-figures and likely inflation-adjusted would be more than the one announced last week that people are going nuts over. Of course, that doesn't necessarily translate into value today-it's dim by today's standards, many of the backlight tubes are off-color, and the resolution is actually lower than the physically smaller 20" acrylic(or aluminum) display. Of note-the 22" was available both with standard DVI and with ADC-in my experience the DVI version is somewhat less common(meaning it's the only acrylic display I don't have in my collection
) and probably also worth a bit more since you don't have to mess with the A1006 adapter.
One thing to note is that if you do ship the Cinema display, you should remove the stand and pack it separately. It's held on with 3 small hex head screws, and takes just a couple of minutes to remove. I've had a fair few cinemas shipped to me(also bought a bunch in person) and I generally remove the stand for anything more than a quick car trip where it's the only thing I'm carrying. I've never had a broken stand when it was removed, while my luck with it still on the display(especially when shipping) is a bit more mixed. Of course, if you have the original box you're probably okay-the only original I have is for a 15" Studio, but IIRC it does support the stand properly. If I DID have to ship one with the stand intact, I'd probably cut a styrofoam wedge to fit exactly behind it, secure the wedge in place, and then bubble wrap the whole thing.