I paid US$130 for the lot, which gives a pretty good bargain rate of US$4,33 per pound. Of course not many people can actually use this amount of unsorted LEGO which explains the cheapness.

As for the unopened bags, I found they belonged to 5 separate sets: 1 Batman set, 1 The Hobbit set, 1 Guardians of the Galaxy set, 1 Star Wars set and 1 generic City set.

I still don’t understand. Abandoning one set, I get it. But five sets spanning 3 release years (2013-2015)? I do not.

Good morning @Hypolite Petovan
Do you mind, its enough for this :
https://rebrickable.com/mocs/MOC-26457/FreakCube/apollo-spacecraft/#details
It weights only 6 kg

Well, that's the thing with unsorted LEGO bins, you can never know. I have briefly entertained the idea that it could have been someone trying to fence stolen goods since it was a Craigslist ad.

Right now it occupies a desk and some of my closet, on top of two full standing shelves for the completed models.

However, I've seen the rooms some amateur LEGO designers/sellers made for themselves, usually with a central table and the walls covered in tiny drawers full of parts.