Selling because the shop was hit by Covid? They can't wait 3 weeks for it to go through? Heck, even if you can go see it it means the shop is open. if not it was really nice of them to put everything back together and pile what's left of the interior in the back and even tie it all down on their way out the door. I think that is the first of a pile of untruths.
To me it looks like someone got a bunch of bad news after the lady took off her dress. Please don't go near it without a through inspection by someone who knows our cars. Not an old car appraiser. not an old Mercedes expert but a W113 (230, 250, 280SL) expert. Not only can a rusty car cost 100K or more to restore but about 99.9 percent of the shops in the US will do it so poorly the car will be worth far far less than you have in it. I believe our member Cascadia if he is still active is out that way. See if you can find him and have him take a look.
A rusty body can easily run to $10,000 to $15,000 in parts alone and triple that in labor and it still doesn't run nor does it have an interior. Getting it to run is much more finite of an endeavor but still not inexpensive you could very easily have $5,000 into just getting it running if it turns over. Sorry if I sounds harsh but I am almost through with doing the exact same thing and I bought my car for $5,000 14 years ago when the parts were a fraction of what they are now. I would never go down that path again.