At least he said it didn't die to be put into a jar. I would guess it died, and he thought to stuff it in then, maybe thinking he would preserve the lovely color. I dunno. I've seen people do weirder things with deceased pets, but that.. that is odd. I like how he makes sure to state that is is "Harmless while in this state" as if maybe a ball python would be venomous otherwise?
It is not illegil to sell animal parts or preserved animals on Ebay. Loads of people do it all the time, think furs, rabbit skins, or feet.. etc, bugs, pickled pig fetuses.. weird yes.
Wolfy