My male rabbit all second day escapes the backyard. His wife stays in the garden and he comes back for her all the time. He goes for adventure to the neighbors' gardens and the nearby park. Our direct neighbors know him and let him go. But I am worried about "strangers" who see him and think he is lost. Maybe they'll catch him to give him a new home. Especially if they see him more than once.
(The backyard is Fort Knox, but he disappears... if someone knows a rabbit-forensic unit, they are welcome!)
He has a chip, but I wish to add more direct information (phone number or address or such) to inform people he has a home.
EDIT: It does not have to be on the neck. Maybe there is another position with less risk of strangulation?
What kind of collar/belt/anything is mostly safe for him to transport such information?