Hmmm, guess that depends on what side of the bed they wake up on! lol
Like the post about the fox visiting three groups of three sets, indicated by the fresh snow, I have observed the same. Yesterday I followed a pair of fox tracks along a cut soybean field that has a steep bank down to a river which runs alongside it. I have sets up on the edge of the field and down along the river. The wind was coming off the field and down to the river. Had half an inch of fresh snow on top of the previous days sheet of ice and it was eleven degrees out. The two foxes knew where each of six sets were and would walk along the field edge a ways and then cut down to the river. They checked each of my sets along the way. Caught three there in the past week so it's just a matter of time until I get another.
My conclusion, they learn quickly and remember where each of your sets are.
You are certain they have been there before and were not newbies wondering through?
A newbies nose wouldn’t tell them where your sets are?