You can always get more pennies from the bank. Looks like you could get 80 dollars profit without even sorting.
However, you are also giving away a possible 9000 copper cents.
2500 cents in a box x 20 boxes x 18% copper cents = 9000 copper cents
According to coinflation, $90 copper cents is worth $198 in melt value. You can probably sell them for ~$120.
So, you cut your potential profit in more than half, however you save the time it would take to sort, and then dump the zinc cents.
I would go for the deal. Reinvest the profit into more boxes
