As has been said, a Velveteen Lop is rather like a smaller English Lop with Rex fur - I know several people who have been breeding them for a number of years. But this person didn't only stick "Mini" in front of their misspelling of velveteen, they also appear to be ignorant about rabbit colors ("dark brown" is not the name of a color in any rabbit breed). So, thinking that the person that placed this ad is pretty clueless about what they have, I'm betting this rabbit is a Mini Rex (probably a Castor).