I've been carrying around an ID badge, and some papers, for an activity that I'd like to tell you about someday. I had a very nice bag to keep these items in, but I needed that bag for another purpose. I took my ID stuff out and did something really dreadful: I put it "where I couldn't possibly fail to find it."
I found it four weeks later, by which time I had admitted it was lost in my house and had gotten a duplicate ID. And then I found it. Really, I had put that stuff in a place where it couldn't be missed. But that's not good enough, is it? Not for me, anyway.
The next time I need to put something away for awhile, I hope I will do two things. One: I'll make a note in my email telling me where I've put it. And then ... Two: now this is my new idea: I'll try to imagine myself looking for this thing, and I'll put it where I think I would look. I'll let you know if that ever works.