Those would be your estimated tax vouchers, to be used to pay estimated taxes. If you don't owe any tax for 2019, and you made no estimated tax payments in 2019, then you probably don't need to pay any estimated tax for 2020, in which case you can discard the vouchers.
You only need to pay in estimated tax if you owe tax because your tax withheld from your income is not sufficient to meet your tax obligations.
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