found a strays Cat live in my garage for a week

this Cat in my Garage more than a week ! came home from work several days I saw poops and urine spot in my garage and lily food bag been tore up , thoughts the possum sneak in side but today I saw this cat because I have move all vehicles outside ! strangest thing though I saw my Tsuki again brought me some animal with gray and white color !!!! just like when I got Lilly before