Little SEA knife for ID

[VVV]

Originally Posted by A. G. Maisey

...snip
I could hypothesise a dozen reasons, but the only way it is possible to know is to have been there when it was done.

Actually even that isn't sufficient to claim that you "know" something for sure and that you not just hypothesize based on input from your senses and your previous experiences of probable human behavior, reasoning etc.
But I really hate that kind of extreme reasoning (not yours but the philosophical one I exemplified above) because it is so unproductive. Somehow people manage to use their uncertain "knowledge" anyway.

Thanks for sharing your idea which I also find reasonable.
Let's see if some other forumite "know" something else about them.

Michael