If the traps are not on property that you own or control, then get over it. If they are on property you own or control, collect the traps and leave a note explaining that the person is trespassing. You could give them back if they contacted you and you felt magnanimous, or sell them back as a nuc, or tell them they will be charged with trespass and keep them for your own use or any other number of ways to go.
USDA zone 11a, Western Garden zone 24 (75 ft elev. n34.0w118.47)