If I were family, I would ask the cops one question about the shoes: “what can you tell us about their appearance when they were found?”
This might yield some interesting answer and bring up some great discussion. Why? Because if they were found on a wet day, and they were very dry or not as wet as they should have been, my next question would become: “how do you explain that they were not as wet as they should have been for the place and weather conditions where they were found?”
Alternatively, if they were waterlogged, if could indicate they had been in the water and may have washed up vs being placed where they were found.
Where exactly were they found anyhow? Along the shoreline? On the pier? Had snow melted making them more visible than they might have been previously?
How about the laces? Did Cameron normally tie and untie them to take them off or put them on? Were they tied and shouldn’t have been or untied when this was a-typical for Cameron? Laces may seem insignificant until you realize that historically spies had used the way their shoes were tied to pass messages to each other. You can google this. It probably won’t apply here but, it knowing this did make me realize the importance of the laces. I would also ask if any DNA besides Cameron’s was found on the laces or in the knot or on or in the shoes themselves. Small items may have big clues.