It looks like the last time this situation occurred was about 6 months before the financial crisis in 2009. Supply and demand for such a product would have seen the prices rise substantially. So I think it is safe to assume that a premium price has been paid for some very large orders for the #10 cans, i.e. they have bought the entire production line for a set period, either by Government (war preparation) or large private bulk purchases (economic preparation) by some very wealthy individuals requiring 25 year stock piles for entire families and hired security hands for their ranches out in the Yucatan.