It looks like the company offering miles for cheese may be backing off on its commitment of 500 American Airlines miles per box.
The current scuttlebutt on Flyertalk is that the compan didn’t anticipate the response, apparently assumed most codes wouldn’t be redeemed, and didn’t imagine folks buying up large quantities of boxes just for the points (which likely cost the company more than the sale price of the product, let alone their profit margin).
Developing… but in the meantime, I wouldn’t go buying up more cheese.