In the event any animal or fowl is released to any person other than the owner or lawful custodian pursuant to and in accordance with the provisions of Section 6.04.120, such person to whom the animal or fowl is so released shall be deemed a purchaser of the same from the city. The purchaser shall receive from the city clerk a certificate of purchase, and the certificate shall be conclusive evidence of the vesting of complete title to such animal or fowl in the purchaser and of the termination of all interest and rights of the former owner in and to the animal or fowl.