Canoes in the woods

I am not from the area but I do take several trips to the Adirondacks each year to hike, fish, paddle, snowshoe... on several trips over the years I have come across canoes near ponds fairly far from any roads. I was curious what the proper etiquette is. Is it, use them and return them to where you found them or, it’s not yours so keep moving? Since I wasn’t sure I have always erred on the side of caution and not used them, but was curious.