Unfortunately big sticks aren't allowed, with that and leaving boxes and other mess all over the office it's the only way :P
Have you tried passive-aggressive post-it notes? If so, the next step is the passive-aggressive company-wide email. I had a colleague in my last job who was the master of those. Always a genuine joy when they turned up in the inbox.
@JWestland started
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Unfortunately big sticks aren't allowed, with that and leaving boxes and other mess all over the office it's the only way :P