You can find the Stella Montis Archives Key randomly in ARC Raiders, but it doesn’t really tell you where to go to use it.
In fact, its description merely states that it opens a door somewhere in the Archives in Stella Montis. That’s a pretty large area on its own, so it’s not exactly narrowing things down much!
Fret not, though, for we’ll tell you exactly where to go to use this key.
Where to Use Stella Montis Archives Key | ARC Raiders

As the key’s name hints, you have to go to the Cultural Archives in the top layer of Stella Montis. More specifically, you need to go to the westernmost part of the area.
Do be careful going there, though! There are many ARCs on the way, not to mention the chance of finding hostile Raiders. Make sure you know how to deal with Shredders in particular, too.

With that said, you just need to reach the northwestern corner of the Cultural Archives. There you will find a large steel door with a keypad, as shown above.

Just approach the keypad there to use the key and open the room! It’s as simple as that, but do remember that keys are consumables in this game. You’ll need another copy if you want to revisit the room later.
As for how to get the key itself, it’s the same as most other keys in the game: luck. Keys appear randomly in containers in every map and area. However, they seem most frequent in Residential and Commercial areas. Still, it’s all random chance.
Nonetheless, there you have it. That’s everything you need to know to find where to use the Stella Montis Archives Key in ARC Raiders!
However, this isn’t the only key-locked room in this map. There’s also the Stella Montis Security Checkpoint, which generally seems to have better loot than the Archives spot.

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