I think that you will find your kee since Moon will trine Mercury.
The kee is in your 5th of children but also a flirt so ask your child (if you have any) or your boyfriend maybe they took it by mistake.
Also, it could be inside of some box, bag, drawer, in a halway or in a small room in side of another room.
Since Mercury is in Sagittarius, the lost object could be on up floor near heet, in the bigest room of an apartment - somewhere you make party or accept guests or where the library or university books are located or where your religious objects and expensive furniture is located. Also in a church, court, gambling place, university, lawyer, library, book shop.
But since it is in your 5th - I thing more of a child or your boyfriend
The coordinates are South - east.
But again, ask a child - maybe you will get an answer or in any other place where you have fun like theatre, bar, casino.