Can this food give off enough energy to melt metal?

I'm currently writing a story, but however I'm having trouble with one part. The hero is faced with a situation where he has to create a fire strong enough melt 5 kg of copper, and he only has a match box, 2 four foot long wooden planks, and 3 boxes of crackers (which have 70 kCal per serving, and there are 16 servings per box). Would setting fire to the crackers be enough to reach these temperatures, with aid from the wood?

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Can this food give off enough energy to melt metal?

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