You could sell each pack for the expected value of opening it, which includes a small chance at some some cards that demand high prices on the singles market.

You could sell each pack for the expected value of opening it, which includes a small chance at some some cards that demand high prices on the singles market. Of course, this presumes the seller has no way of determining the card content of an unopened pack, in which case the only packs that would remain unopened would have cards worth less than the expected value. I don't think I could trust any seller to not somehow "peek" inside an apparently factory-sealed pack. I'd probably try a pinhole fiber-optic borescope, poke it through a not-very-noticeable spot, and try to identify the rare card, if I had any.