Bob and I have been tracking any time we look for something that we know we have. It's become a game to us, if we start looking for it, we merrily announce that we have been caught by it. Even though we're actively paying attention to those times, it only seems to happen at most once or twice a day. Usually I'm looking for my camera to take a photo of a bird or bug in my back yard and I forget where I last put it. I need to come up with a "camera home location". For example I used to lose track of my schoolbooks in the general house clutter. Now I *always* put them back on top of a specific shelf as soon as I'm done with them, and it's so much easier. I always know where to find them.
I have a hanging spot for my keys so I always know where the keys are. Really those are the prime things I look for.
The last thing we hunted for, which took about 10 minutes, was a second micro-USB cable. I have one on my desk I use for my phone and mouse, but Bob wanted a second one for him, and we knew it was in the house somewhere but not where. So that was something we had to track down.