There are several things to look at as noted above.
Without locality data you'll never be 100% certain as some people have crossed BCC and BCI and sell the young as BCC for more $$. Other snakes may not show "typical" traits that are common amongst the species.
Then there are these:
A boa displaying what a natural cross between BCC and BCI would look like according to Vincent Russo.
This is a Barranquilla, Colombian BCI, and I've been told by very good sources that the breeder, Gus Rentfro was close to calling these BCC.
There are boas from Venezuela, BCC and BCI that also stump some folks.
That said GENERALLY, once you are able to see certain localities over and over you can develop an eye for making a good educated guess. This is not the same as scale counting obviously.
To me, Going Postal's snake looks to have strong Suriname influence with the nice peaked saddles. BCC!
THE COMPLETE BOA CONSTRICTOR By Vincent Russo really is a great resource for you if you are interested in "Whats what".
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