Help needed

[BCMan]

About three months ago I homed a rescue BC from the herp shop I deal with. She was confiscated from her previous owner because she was in really bad condition; she had not shed for a very long time. I have kept her in a very humid viv, and been taking her to a vet just about every week for the last two months. He was giving her vitamin A injections and washing her, meanwhile I have been bathing her at home and pulling off loose scales. Then the best thing happened just now, my gf was pulling loose scales off and a big thick lump of skin came off, revealing lovely new skin underneath. We started taking more and more off and now just about all the layers of dead skin have come off, apart from most of the head which is loose enough yet. She now looks really nice, but I am confudsed as to what type of Boa she is.

When I homed her I was told she was a BCI, but you couldn't see any colour or pattern because she was so thick with unshed skin. (Incidently, the vet, who is a well recommended reptile vet, says it is the worst case he has ever seen.) Now it has all come off we can see the pattern and colours. She has a BCI style pattern down her back ie saddles and side markins, but the tail looks like a Mexicans tail with the criss-cross pattern. Her ventrl scales are very dark and heavily freckled, while her overall colour is mostly black. This is not like my common boa or any boa I have seen. Does anyone have any ideas? My thoughts are that she is either a mexican cross, or more likeyl, she has discoloured through not shedding for so long. I will post pictures as soon as I can get some of her. Any suggestions would be helpful though.

Thank you
Jamie

ps I am really chuffed our hard work has paid off!!