I wrote this quick guide because during police hours the smuggle route next to the police checkpoint triggers a search, so its not really viable during the night.
How to Find Alternative Smuggle Route
Simply jump on the car and toss the backpack over the fence while jumping. You may hit an invisible wall the first few attempts.
Travel to sector A and retrieve the backpack from near the truck/trashcan.
But Does It Work the Other Way Too?
That's a good question! Simply follow the wall to the right until you hit the air vent. Stand on those wooden pallets and toss it over the wall while jumping.