I don't think anyone is ever going to find real evidence of the Squatchs unless they want it found. I don't think that is ever going to happen.
Dave cries like a little one legged girl whenever someone calls them Squatchs.
He spoke to a First Nations fella who told him it is bastardizing their word.
I CALL SHENANIGANS!
It covers the entire clan of 'em - Sand, Sas, Sam, Swamp, Sask...