Today i got 9 keys from sweeping (used around 250-300 stamina) after that i start doing Wanted misions and got x2 keys 1time only . Later i try to get my last key ( i was thinking i can get 1 more) but after 200 more stamina used i get nothing and i give up. Tommorow i will go for misions first for sure ... like almost every time we dont have all information we need to know about events :(