Samela,
I do have sympathy with you, after my shed was turned over last year along with several others I was upset, I would do what others have suggested and go down to your local car boots or second hand shops don't waste your time with the Police, they don't give a T--s, unfortunately for me I know most of the scum that get up to these tricks in our town and on the last occasion I got to bottom of it, :)