I highly believe that if I had a CC to trade it would not matter at ALL if it was BNIB if it was a color you wanted. As long as it was in good condition it really does not matter, and to be fair not all of CC's skulls are brand new when he sells them to you, some of them have been around for quite some time, just that he had forgotten about them and decided to sell now (i.e. factory f2s, and random CC's from his past sales). That baggie you have it kept in DOES NOT make it BNIB, it's also kind of sad that the CC is not being put to good use... also furthers the point that people are purchasing for the sake of owning, not using.
It is understood that these CC's will be kept in good condition and maintained with proper care so BNIB is not really a selling feature for most people.