I entered the serial number of my Macbook Air 11" (Late 2010). I confirmed that it boots up, has no defects, has no optical faults and that I will include the power supply.
Apple offered 10€ ($12).
Yay?!
PS: This ancient notebook runs macOS High Sierra with the current 2020-2 security patch and sells for an astonishing 200€ on eBay.