The LE interviews/statements have documented that Simon B, the tow yard manager, took the bag from the trunk in George's presence when George picked up the car.
Simon then threw the bag over the fence. Later that day, he retrieved the bag and threw it in the dumpster.
During the night that night, LE retrieved the bag from the dumpster. Not knowing LE had retrieved the bag during the night, Simon tried to retrieve it from the dumpster the next morning to give to LE.
There's a sticky for the LE interviews/statements.
ETA: None of this refers to Amscott, but to the tow yard.