This is extremely frustrating. Nobody stole your bag from the parking lot. I reviewed the security tapes that survey the lot. There was nobody in the parking lot throughout the entire game. If someone would have broke into your car to get the bag, there would likely be more items missing and damage to your car. My guess is that you misplaced it somewhere along the way.
Unfortunately, I have other guests that stay in the unit. The unit needs to be cleaned after the previous guests have checked out. Check-out is at 11am. You are given access to the unit as soon as the unit is cleaned.