This suggests that the perpetrator had a bag under the seat and pushed it back to reach it easily. I agree, getting out of a hot car, leaving the drivers door unlocked while locking the passenger door is just not logical.People who work outside can sometimes look suntanned I suppose, but I did at that time, and I didn't look suntanned....
AS says all the way back.
The passenger door being locked is a bit odd too. You can easily lock it from the driver's seat - Fiestas are not wide cars - and you could lock it, get out, shut the door and it would stay locked. Funny things to do when ditching a hot car in a hurry though.
Logically this suggests the perpetrator was alone, SJL was somewhere else and he needed to get back quickly.