I live in upstate NY (tug hill region) and I have heard that a few different people have seen 2 Mt. Lions running together up here this summer.
1 doesn't worry me too much, but 2 together means trouble.
Whether there is an actual reproducing population around NY I don't really know, but it woudln't be hard for someone to have one illegally and it to be let loose or get loose. I've heard a lot more wild boar sightings around the state because of illmanaged game farms.