Rng is a bitch.
at the beginning of 13th season i run something like 35-40 countess before seeing a single key. so i was seriously thinking they had changed the drop rate in RotW. After that boom: 5 keys in 9-10 run.
this is kind of funny, I actually forgot countess even drops keys. I made near 10k fg in a week last season mostly running countess with a hysteria blade warp warlock but I didn't see a single key afaik. Then again I was looting the weapon and armor racks and full clearing, not just rushing countess.