Leave them there ....measure exactly where they are from the wall, the side of the rack, etc ....take a good photo ....mark them with smart water and wait ......if you have a camera video, set it up !!! I love a mystery ...makes me laugh ! You have to let us know what happens ! Years ago, my father had a neighbour who had recently moved in, and she found a pair of gents slippers (she was a widow with no men friends !) on top of her pedal bin in the kitchen ....when she told my father, he said 'Ah - they are Mr. Pallant's ' .....the old chap who lived in that house before he died. As soon as she told me, I instantly knew who it was as well ....he always stood on the doorstep in those slippers, speaking to all of us on our way to school .........and when she moved them, they came back during the night ..........I kid you not ! ........she said she was the 7th child of a 7th child, and as such, had psychic leanings ....but I don't know about that !.....