right, I am just skeptical that they could remain stuck together given the dynamic forces at play in the dredge. Admittedly, my skepticism isn't really based on any empirical testing or first hand knowledge of this type of dredge system, only the imagination of my mind I suppose combined with some of the basic data points discussed here so far. What I see is suction + water + sand + other sharp debris + a wiper bar and then some type of forceful ejection out of the 24 inch pipe.
Clearly, larger items do make it through the dredge, and that can mean that the money could as well. But the question is could the three packets, congealed together, remain together through the dredge ? I can't say that they couldn't, that's for sure. I guess without understanding how strong the bond is between the packets and the forces under which they could be subject to within the dredge, it's a tough answer.
On the other hand, one can argue that the forces inside the dredge could be responsible for rounding the edges of the packets too....I wonder if one were to examine the edges of the bills under magnification, if it could be determined if the edging indicates a tear or not ? Sorry, now I am all over the place.