Be very careful often times people stick a cutsie name on their ad to make their normal snake sound more like something it's not. There is a Spotnose ball python that was proven by VPI - however there are very few people who are working with a genetic Spotnose - there are a lot of people that have balls with a couple of spots next to their nose which they call spotnoses but they aren't - The Spotnose. This is VPIs Spotnose that creates the Powerball:
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As for bandits - it sounds like another cutsie name someone put on a normal ball that has it's mask/crown/halo that connects at the back - no big deal I've seen some pastels/normals/hets that have this. Don't know if its genetic or just a fluke (anyone else know?) Heres one from the classifieds:

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Tosha 
"Nihil facimus sed id bene facimus"

10.35.0 Ball Python (Harry and Fluffy and gang)
1.0.0 Angolan Python (Anakin Skywalker)
0.0.1 Green Tree Python (Verdi - yeah I know but my kids love the book)
0.2.0 Feline (Pippen and Pandora)
0.0.1 Desert Tortoise (Pope John Paul aka JP )
2.2.1 Fish (1,2,3,4)
0.0.1 Lizard rescued from feline
0.0.0 frogs rescued from pool skimmer