No we dont. Could easily be an escapee or released pet.
I doubt it. There have been several sighting in various areas over the past decade. In 2009 they even collared one:
http://www.livescience.com/5316-rare-jaguars-spotted-arizona-mexico.html
A Jaguar named Macho B died in Arizona in 2009, but another was spotted in 2013:
http://www.huffingtonpost.com/2013/06/27/jaguar-photos-arizona_n_3512002.html
My glass is half full on this one!