Returning the Favor

Returning the Favor is a Minutemen side quest in Fallout 4.

Detailed walkthrough
Upon reaching Abernathy farm the Sole Survivor is confronted by Blake Abernathy, who has a couple of questions for the stranger on his property. Over the course of the conversation the Sole Survivor learns that Blake's daughter, Mary, was killed by a gang of Raiders that attacked the settlement. They also stole the heirloom locket that Mary was wearing, which has left Blake's wife Connie greatly upset. Blake asks the Sole Survivor to retrieve the locket from the Raider hideout in USAF Satellite Station Olivia.

To complete the objective, the Sole Survivor must retrieve the locket from a toolbox in the basement of the station. The exterior of the station is guarded by several Raiders on the walkways. There are also several bloatflies and a group of mole rats outside the station, including several dangerous suicide mole rats with frag mines strapped to their back. The mole rats and the raiders will often wind up fighting each other, making it easier for the Sole Survivor to enter the station interior via the bunker.

Inside the station, the Sole Survivor will encounter a laser trap, followed by several rooms full of raiders. The raiders do not need to be killed to complete the quest, but retrieving the locket stealthily can prove difficult due to the number of enemies in the enclosed space. The toolbox containing the locket is guarded by Ack-Ack, who is always equipped with a minigun. This can prove quite dangerous at low levels, so the Sole Survivor should proceed with caution.

After retrieving the locket, the Sole Survivor can return to Blake to complete the quest. He will reward the Sole Survivor with ~100 caps for their efforts, as well as granting access to the settlement workshop. Thereafter Connie Abernathy will give the Sole Survivor a 25% discount on all purchases, and pay 25% more when buying items from the Sole Survivor.

Bugs

 * Sometimes the locket will not spawn in the toolbox in USAF Satellite Station Olivia and will instead spawn underneath one of the plants at Abernathy Farm and be unreachable. Using an explosion of some sort will dislodge the locket and allow it to be picked up.