Appears to be about 2 feet. If you speed up the video you can better appreciate the in/out wave action caused by the freighter
The wave action would cause debris to be tossed to shore.
Be nice to have freighter activity logs for about the time the money supposively washed ashore.
If I remember correctly a Crewmen on a freighter in the area notice a white parachute or something dangling body? from its underbody. It disappeared not long after they saw it.