Wow, you have TWO BPs that are turning 30 years old this year? That's very impressive!
Other than the fact that sand will scratch a plastic enclosure (if that happens to be how you're housing them), I doubt that it will matter at all as far as your snakes are concerned. Tiny scratches that result from cleaning the plastic surfaces are more likely to trap pathogens, but a little sand isn't the only cause- even paper towels have been known to scratch plastic. The ground outdoors where BPs evolved is surely a mixture anyway. Overall I'd say it's not a big deal, but you might give the source some feedback about it, especially if you find it to be objectionable.
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