We haven't heard much specific about search locations from the original searches with a ton of people in the early days and some later rumors and of course the pig farm/ Highway 21 searches. However, I imagine there was a lot of searching in those first few hours and days along that route, but it would be hard to know what you could find given the bad weather. Probably not a lot, unfortunately, with all the wind and rain.
I don't think this falls into rumor, just speculation, but in one of the early threads someone Google Mapped the route from her house to her mom's and we noticed that the route showed traffic right in front of the high school. I'll see if I can go back and find that. We speculated it might have been searches but I can't remember if any locals weighed in on that.