Easy, sister...

From what I've read (reputable sources only, please), the furthest east an honest to god, born in the wild cougar has been found has been Iowa. It was hit by a train.

Without a doubt, they are moving east. But they're not here yet, so take it easy.

Some escaped pets in DE, one escaped from a zoo in NY a decade ago....the rest are urban legends.

Look at this way...you would be SO famous if you could provide some physical evidence (including the DNA that you are screaming about) to the proper folks, like the NY DEC.