That woulda been cool (for a few minutes anyway, then I'da told him to "pipe down"). I seem to find derelict banknotes on really windy days like today...
Wasn't Minn. a popular destination in the late 1800s for Scottish Immigrants? The fur trade? The Native Americans respected their courage. I know stuff. The point, I would not be surprised that you found the Note, I imagine there are many multi-generation Scot families and Scottish visitors to Minn. I know the Irish would rather they stay there, but still.....