Although most of the signs of a BCI/BCC can be wrong(think het pied tracks, generally accepted by not always accurate) you can sort of tell by looking what a BCI is. See the dark patterns on your snake? Those are called saddles--they go like this--->) ( ) ( down the back of the animal. A BCC generally has saddles that sort of have a spike in the middle of them. Look up suriname red tail and look at the dark saddles and you'll see that center bump. Now when it comes to things like morphs and line breeding these traits aren't as accurate, but it's a good starting point to figure it out.
Also true red tails usually have more red on their tails, less of the orangey color BCIs get. They'll also be closer to 200 dollars than 70 dollars when for sale! If the guy didn't know what he was doing it is most likely a BCI, they are the most common
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