I think Petco buys from breeders & wholesalers, and there are perhaps a few unscrupulous breeders who can get away with passing off w/c as having been produced
by them, & if they bought from a wholesaler, it could be a legally-collected w/c? Was the snake labeled either way? (c/b or w/c?) It's rare to see snakes in pet shops
with records of any kind, feeding, hatch/birth date, source, etc., which is a shame, IMO.