Fun fact in Mass, non posted property is open to the public. That is unless you have signs posted to advise of no trespassing, or have served notice to a specific person, then the public and any non served notice persons are allowed on the property. So even if the cops found the male party on the neighbors lawn, there would be no law broken. He would have to explain the bike if it was in his possession at that time. Such as I'm at the wrong address, etc etc. So step 1 ... Post signs of no trespassing. Anyone on the property after that needs written permission to be present.
IANAL this is not legal advice. Check with an attorney for your specific situation.
IANAL this is not legal advice. Check with an attorney for your specific situation.