Without an experienced trike person to look at it in person, there's no way to value it.
There's so much stuff that needs looked at, especially with the low availability of many replacement parts and the prices for NOS ones.
From the pictures, the center part of the rack is missing, the forks are very likely shot, and it looks like there's zip ties in the rear fender.
With the center of the rack missing, the cover for the tool box will end up broken, if not already. Look up 200ES forks and feast yer eyes on those problems and a total lack of new parts available, they're not rebuildable.
What about the U-joints, the final drive gears? That can get expensive really quick. If it's been in a lot of snow, water, and mud, those parts will take a hit if not meticulously maintained.
Good luck finding a new OEM clutch drum if that one is worn, same with the brake drums. New shoes in worn drums won't help anything.
OEM or Chinese carb? Has air filter maintenance been kept up? Steering bearings loose?
Even though they're relatively simple machines, if it's not an honest turn-key type of trike, the money needed to fix it proper can quickly outpace it's value.
It's no different than most other vehicles. They need a thorough looking over by a very experienced person if someone is to get what they're paying for.
This isn't the 90's anymore, trikes can suck up serious money to properly repair and they're not a dime a dozen like they used to be.
In the grand scheme of things, $2,000 is squat, but will that purchase what you think it is? A buddy of mine just spent $2,000 on motorcycle wheels, but those are custom and new, and also not the most expensive, but pretty nice. He got what he paid for, with a warranty.
If you're set on it an will grit through the problems, then what's two grand? $2,000 can turn into three or more in a hurry. If you're going to buy it anyway, it doesn't matter, but you can't complain if it's not what you were hoping.
The story of three wheels and a man...