As said, there is no magic solution. Search first in all of the likely places, under couch cushions, in the pocket of a jacket you may have placed back in the closet, under car seats, under a stack of mail, newspapers. After exhausting the easy solutions, develop a plan to go through the house, room by room, drawer by drawer, etc.
Definitely don"t know much about Near Field Communication, but if your cell phone had it, would it be thinkable of detecting it by kind of "reverse" NFC?
And what about using a normal, common metal detector?
And as regards "search all over the place" - even your car or garden house would be part of "your place", and lots more that come to mind only by and by. Good success and/or luck!