Unless there are physically more pieces that can get fit into the car you usually can start from the cabin and organize all the way to the back, such that your egress is through the vehicle rather than the &&&&ed up belt. I assume you did not crap the boxes out and somebody else is.
In worse-case scenerios I am lucky enough to have package car gaps to sort my egress issue into, if it takes a whole lot of time without making any progress whatsoever, it means it's working. Keep doing that until it is safe to work in the area again.
In total the cost of a supervisor sending you to an egress issue frequently is in the vicinity of 1-2 hours with extremely low performance (drivers: think the time sorting a load but 4x that) as you clean it up.