MacBook Pro Mid 2010 256GB, Good condition
Xbox One S 1TB with two controllers and vertical stand, like new
400-500 euro. Depends on how lucky you are on ebay.
For a MacBook Pro from 2010 you will not get 400 euro more.
Depending on the equipment (RAM? SSD or hard disk?), The condition of the battery and possibly damage to the case, keyboard or monitor are a maximum of 200 to 250 euro in it.
For a brand new MacBook Air 2017 you pay in trade around 800 euro. Against this background, you spend for a soon 10 years old notebook no more 400 euro.