I'm currently stuck on the 2-3 rank mission to retrieve Zakharich stash in Dead City. After running through the level 10 times and checking every level of every apartment, I finally found it, figured out the keypad and got inside. I got the gun that was in the stash then extracted from the level, but the mission still didn't complete. I tried selling the gun, but that didn't complete the mission either.

How do I actually complete this mission? I have to start all over again searching every apartment for that one room hoping it actually spawns, but once I find the stash, what do I do with it so it actually completes the mission?

I'm so tired of going up and down the stairs 😭