My two cats went missing a few weeks ago

I live in daly city and my bonded pair cats went missing one right after the other a few weeks apart. When the grey one went missing I airtaged her sister. She went missing in front of an abandoned house and her AirTag collar remains unrecoverable in Thorton State Beach Park. A stable nearby reported there is a woman squatting nearby who was stealing their barn cats and destroying their airtags. These are my babies I have been raising them since they were given to me by their mother who was a feral colony cat. If you have any advice or suggestions please let me know. Reason to believe stolen. Offering a 1600 dollar reward for the both of them returned safely. If you have my cats please understand both have medical needs!!