Comp coverage is more of a “premium” type coverage not not legally required. Most folks carry it while their car is still being paid off or fairly new. It only covers theft in relation to the automobile though, not non-auto related items. So if you had a laptop in your bag and you bag was stolen out the back (locked or unlocked) your Comp policy would not cover your loss. You could file a claim under your homeowners or renters policy and the theft would be covered but most of the time it isn’t worth it because of the way those policies are structured but yeah, the car itself, locked or unlocked you comp policy would cover the loss.