This might sound a little whacky, but I have a tried and true method. First, I acknowledge that all things are alive and aware. Then I give the lost thing some respect and let it come back to me in its own good time. I find that to work especially because my old way of dealing with losing something was to get angry about it. Now, I just allow it to return when its ready to return. It is great for me because I seem to lose things frequently. I also stopped thinking about losing them as negative, and recognize that there is some purpose for the loss, however insignificant it might seem. It works like a charm!