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Wow. Nice score! (I'm jealous).
Now if they really work...
omfg. These things are a dream to listen to for any computer history fan. They purr like giant cats! Don't start it up there though, he may make the price higher. ;)
Again, be safe and have fun.

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I wouldn't know the first thing about how to fire that thing up. I was 3 when it was sold! LOL. I don't know how to even navigate that screen. I am going to try my best not to damage anything loading. I know he mentioned it had a little water leakage from the roof on it, but I think if it wasn't powered up at the time (99% sure it wasn't), then it should have all just dried up and been good. A true barn find.

Plug it in and Flip the switch. Lol
Assuming it powers up-- and the master password wasn't set:
You should get a "B>" prompt
Input "bld" and see if anything happens.
If you get any response beyond a blank screen you can ebay the parts. If not the memory is shot, or missing, among any other issues; and you'll make more from scrap than selling it fixed. Rare and dead doesn't make it expensive. Unfortunately. Bills to fix these start at 5 digits. Not counting labour. But you'll get some fair value still, pulling it all apart.
There's a real good breakdown here with inside shots.
I've sent quite a few various parts from the 36 series to boardsort and most have fallen into peripheral but with some in midgrade and about a third being telco. The transformer will fetch a nice bit at a local yard too. And silver and tin when clean always have buyers. Plus all that steel and well...!
That link though should wet your appetite!
Still can't figure out what made the 2xxx self processing terminals $10,000, and the XT just $3000 when they were generally identical; but that's a whole nother discussion

As long as it was off, water would have little impact. Biggest issue I've seen was mice. Attracted to the em fields. Like cars they make a bit of an issue chewing through things.

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IF it all works, what do you think it would be worth? I know its a long shot being in a tiny farm town 2 blocks away from the cotton co-op gin (probably mice), but its a shot. Hopefully atleast a couple hundred bucks in scrap. Im assuming most of the weight is bc of the steel case and power supply transformers?

Working completely? 10-15k on the high end. 800-1200 on the low end. Totally dependant on what's in it as far as expansion.
The big thing is no master password (or know) and having the load disk in the magazine. Without access and a missing boot disk you're at 800ish if everything else works. Missing any expansion at all.
Beyond that a full tray of memory that works is worth more than the whole machine. Especially the rare track, bus, and bubble memory boards and the memory itself.
As scrap, a few hundred minimum. Even at raw back it to the dock copper breakage at 10c-15c per lb you're over $80 so there's minimal risk depending on what the upfront price was. Pure profit if this was a haul and go.

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Its a 5360 HEAVY unit! The floppy drive cover door got broken some during the lift, and it all appears to be there. Disks I have no idea about. Got a bunch of monitors/keyboards and monitor bases that have the keyboards attached also. As well as a 600 line per minute printer. Will use my engine hoist to lift off the truck, took 5 of us to load it. Needs serious cleaning, and a large diameter data cord had to be cut to get it out. Looked to be hard wired to a wall plug or something. About the nastiest building I have been in.

I paid nothing for it. 30minute drive and down the road.

Yep. I wasn't exaggerating the weight. As you now know.
Got a couple of I/O trays I can see so your off to a good start. I also see mouse damage right off in the I/O door on those wires so this is most likely a scrap job rather than salvage.
What you're looking for now for any potential ebay work is keyboards (AD Bus terminal keyboards run $5-10 doa as long as all keys, and the plug, are there.
Bubble memory. Will look like small aluminium square CPUs with slightly rounded metal cap. Thick pins. Start at 50 cents-$1 dead/unknown on ebay per chip for this design, if it has any.
...
Be back in a few ; nice score

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IBM was a large consumer of silveride in the 1970s and 1980s, ahead of The DOD/Air Force and NASA, not not as much as DEC. You'll find a lot of it in cases, RF shields, jacks, ports, and connectors. Another thing to keep in mind is in from 78-86 silver price (cost) was all over the place so any parts that are silver other than the silverid is going to be an alloy of some sort. None of it inferior like today's plated stuff but as low as 45% on wedge contacts.
All said you can make as much as you want the more you break this stuff down. Awesome find.
Good luck.
And if you have questions feel free to post.

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Those wires are the power and data cord that got rashed some during the load. But, I will tear more into it in the coming days. What are the HD disk platters made out of? I don't want to ebay stuff really (scraping is 1 of 4 jobs I have) as I don't have time to be honest. I would rather sell to a board buyer or contact buyer.