How can I legally recycle used computers

Acquisition of second-hand cell phones is the same reason, must have ID card face to face verification, like second-hand computer trading, you can only look at the acquisition of ID card is indeed my name, write down the name, no right to ask for a copy of the ID card, you can leave contact information. You can also write a receipt for both sides, if the computer is sold, you can then pay the original owner.