He sure is pretty, I wondered too if one of your neighbors found it or one of their kids had it for awhile and didn't want it any more and they knew you keep box and just dropped it over the fence as an easy way to get rid of it to a good home? Or maybe he smelled all those hot ladies and said "I gotta find a way to bust into that bar" and either dug under or climbed over using a leaning tree or something.
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Jeff Benfer
gartersnakemorph.com