After Queen Oasis was killed and the SandWing treasure was found missing, the SandWings followed the hoofprints of the scavengers' horse to the scavenger den. The SandWings (specifically Burn and Smolder) burned the den to the ground and searched for treasure, but did not find any.
Sunny traveled through the ruins while following Fierceteeth, Preyhunter, and Strongwings to the Kingdom of Sand. When she was dreamvisited by a scavenger, she figured out that it was in the ruins and flew there to look for the Eye of Onyx. Sunny discovered two scavengers there, who she named Holler and Fluffy. She made them retrieve some of the missing SandWing treasure which was hidden nearby. She later came back to collect the rest of the treasure from Holler and Fluffy.
On the map of Pyrrhia, two scavenger dens are mentioned.