I see two photos that look like the entrance from the garage into a slate-tiled back hallway that also has a door to the outside. No laundry or mudroom sink visible in those photos. (Photos 11 and 12) Although there could be a sink or powder room in that odd rectangular area with two doors next to the back yard door....
INTERESTINGLY - IS THAT A SECURITY SYSTEM PANEL ? In photo 12, I see a panel on the wall between the door to the garage (which has a deadbolt!) and the door to the basement. Underneath it is a white light switch so it's not for lights. It's either a thermostat panel or a security system panel. It looks a lot like my ADT security system panel. You wouldn't put a sprinkler control panel there or exterior lights there. I'm not sure why you would put the thermostat there, it makes much more sense to put a security system panel right there where you get into the house from the garage !
https://www.zillow.com/homedetails/69-Welles-Ln-New-Canaan-CT-06840/57324591_zpid/?mmlb=g,11
If it's a security system panel, the security system will be able to detect when the secured doors (such as all the doors to the outside and the garage) were opened, which could give a much more precise time when someone was in the garage!!!