Despite Michael, Peter, and the other five members of the white auction searching the entire site auction, they weren't able to find a single trace of Devon.
Though they hadn't seen him for quite some time, Devon had always been someone who liked to be alone as several things were on his mind, and being the strongest among all of them definitely wasn't something easy as all the pressure would fall on him.
The fact that they weren't able to sense his aura made them believe that he was in one corner of the auction training himself, so he would be able to help the auction if any sort of danger was to happen.
And after Derek confirmed that he was still in the auction, they all decided not to bother with it anymore and continue to live their life.