LEGO instruction manuals can be worth some good money depending on which set it belongs to. Unless you're planning to sell a wholesale lot of manuals, you should probably stay away from LEGO City and LEGO Friend manuals. These only sell for a few dollars each, so you'll have to decide if they are worth your time.

Do you keep Lego instructions?

Keep them, I you have the set you should have the manual. If you ever want to sell a set you'll have the manual. I use a large plastic storage dresser to hold mine. I got an expanding file and labeled each folder with the type of set.

Can you sell Lego instructions?

4 Answers. Selling used LEGO is definitely legal, at least in most legal systems. One of the most basic property rights involves the right to transfer ownership as long as both parties agree on the terms. Even selling items under copyright (instructions, box art, games, etc) is legal under the first-sale doctrine.