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You’ll take on plenty of quests that send you into the Dam Battlegrounds in Arc Raiders, including one from Tian Wen that asks you to search apartment buildings for Major Aiva’s Mementos. On paper, this task is fairly simple, but with multiple buildings to check and the constant threat of ARC units and other raiders, it helps a lot to know exactly where to go so you can grab the item and extract quickly.
Because you must successfully extract with Major Aiva’s Mementos, it’s strongly recommended to equip an augment that allows you to store an item in a safe pocket. Once you collect the mementos, you can place them in that secure slot, ensuring they come back with you even if you’re killed before reaching an extraction point.
With that preparation covered, let’s track down Major Aiva’s Mementos and finish The Major’s Footlocker quest in Arc Raiders.
Major Aiva’s Mementos are located inside an apartment building at the Ruby Residence point of interest. This POI sits in the northwestern part of the Dam Battlegrounds map.

After reaching the apartment complex, head into the building on the far left. The item you’re looking for is on the top floor of this building, but not on the roof. Go up two flights of stairs, then loop around and move through the rooms until you reach a dead end. You should see a window and a desk in the corner with a box placed on top of it.

Inside this box you’ll find Major Aiva’s Mementos. Interact with it, pick up the item, and make sure it’s safely stored in your inventory.
As mentioned earlier, you must extract with this item to complete the quest, so having a safe pocket available can make a huge difference. Your closest extraction options are usually the Central Swamp Lift to the south or the North Complex Elevator to the east. In most cases, the North Complex Elevator is the safer route, as the Central Swamp area is often crowded with players hunting mushrooms and completing other objectives. No matter which extraction you choose, move carefully and make sure you get out alive, raider.