There are several genetic Hypos out there and still many other unproven ones. All have amazingly varying degrees of Black, there is no hard set rule of how many tail saddles have black borders or not. Throw into the mix the F1. F2, F3 etc and the Super, possible super, Pastel Super, High Pink Hypos, Caramel Hypos, T Albinos and unproven T albinos then you have a crazy possiblity of hypos.
I would suggest that you take a look at Rich's website (I think it is www.salmonboa.com) and look at the original Salmon Boa that he produced his line from. The adult was very dark with lots of speckeling and may not have ever been reconized as anything unless Rich had followed his hunch we he saw the snake. Talk to the seller of the pair you are looking at, if you are unhappy with it don't buy it. If you are just unsure post a picture and get opinions from others. The Business is not as dirty as it use to be and many of the fraud dealers of the past have rooted out and made public, so a dealer selling a normal pair of Boas and calling them Salmons would really not make a huge enough ammount of money to make it worth it, now a private keeper might be a bit different, but just look into it a bit more.
I hope this helps, let me know if you have any other questions.
Thanks
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Jim Hopkins "Hoppy"
Hopkins Holesale Herps
Hopfam1@aol.com