from the sounds of it... (Off-Topic)

by Laird, Sunday, December 07, 2014, 19:11 (3437 days ago) @ INSANEdrive

The XB1 you bought still has the previous owners account on the box, or... they have it set as their "home" console which means all their games will autodownload to your box they buy digitally. You can also play them, alot of people who trust their friends/family do this in a Pseudo-"game sharing" plan.

A friend's kid does this with his buddy all the time, one buy's COD, the other buy's halo digitally and both get copies as they download automatically to the "home" console.

http://www.gottabemobile.com/2014/08/30/how-to-share-xbox-one-games-with-friends/