I wud recommend putting your initials and phone number and NEVER leaving in some random boxes. Keep your paddle in your case or in your hand. Especially one that is super expensive!
My paddle was "accidentally" taken by a lady from the paddle rack line-up. I just purchased the paddle two weeks earlier and was in complete panic over it. I didn't have my name on the paddle, and no way to prove it was mine. After asking several people about my paddle, someone pointed out the lady who had it. When I confronted her, she said that she thought someone had left it behind, which made zero sense. My paddle now has my name on it.