We had a 'garage cat' that disappeared after four years of 'hanging out' for food and shelter...walked the neighborhood for a week calling her name...she wandered up to me while tending the garden seven days later...no idea where she had been. She had some minor injuries, but looked no worse for her experience. Stunned by a car? Hurt by a dog or raptor? No idea. (No Jurassic Park jokes, please.)
Hopefully, your kitty will wander home when the tummy starts to rumble...