Missing Cat

I recently moved back in with my parents and I've been trying to acclimate my cats. I'm pretty sure my parents locked this boyo outside though. He's pretty skittish and I didn't really intend to have him outside too much, but my parents, while I was gone, left one of the doors open all day. If anybody happens to notice him, I'd greatly appreciate some info or help! We live near 8th and bowdish in the valley.