MISSING CAT (Citrus Heights 95610 area)

This is my baby Louie. I can’t find him in my house and I’ve looked EVERYWHERE (I have a big house so he might come up... but I’m also scared because cats hide when they’re sick or somethings wrong, and like I said he’s always with me like that’s my son so I really don’t think that’s the case). He usually greets me at the door everyday with a loud meow to welcome me home... I’ve had him almost my whole life and don’t believe he would run away so I’m rlly scared. If anyone sees him PLEASE let me know asap. He has on a blue checkered collar with his info and Petlink on it, but it’s a snap away collar and might come off easily so I’m not sure if that’s reliable anymore but he is microchipped. Again if you hear or see anything PLEASE let me know!!️