According to Hyperion, Lilith is supposed to be dead, but a bandit has been spying around, so she wants you to take care of him. Head to Three Horns - Divide and there’s a small gap in the rocks that leads up to where Boll is located. Boll is a Rat and is accompanied by a bunch of Skags, so unless you’re trying to complete the one challenge where you kill Boll without touching a Skag, it’s better to take them out first.

As it turns out, Boll was in possession of three ECHO recorders that proved Lilith was still alive (besides another that he drops himself). You will see three general areas highlighted on your map and it’s up to you to find out where the ECHO is located within that area. The first one is located directly next to your location and before you leave the area with Boll, look towards the structure and you should see an anchor hanging with the joint holding it in place flashing green.

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Shoot the connector for the large anchor (left) and you’ll find the ECHO on the actual anchor when it falls to the ground (right).

Shoot that spot and the anchor crashes to the ground, where you can grab the ECHO off of it. The second ECHO is located to the north and is stuck inside of a broken up thing that’s sticking out of the ground. There’s a valve on the side of this broken pump, that when used, will send the ECHO flying out of it and onto the ground.

The third, and final, ECHO is located south of where Boll was located. It’s past where the entrance to Frostburn Canyon is located, by some pipes that are coming out of the landscape. Go to the edge of the cliff and look below to spot some pipes running to a tower or building of some kind. Jump down onto the pipes and follow it to that structure to find the ECHO on the side of it. Return to Lilith in Sanctuary to finish the mission.