I wouldn't have said fenestratus either - I think your retailer has no clue what they sent you and is just guessing(same as us). I thought juvie fenestratus had a more solid lateral line as well as vertical bars. I'm growing out Lago Catemaco fenestratus but not regular fene, so I'm not sure. My guess is still bifa. Grow the fish out and keep posting pics, I'm curious to see how it matures.
Also, I would not use that online source for fish again. They don't seem to know what they are doing. I'd stick with Jeff Rapps, CoA, or Cichlid Connection - just some sources with good reputations. Hobbyist fry from this site would work too.