Box 2a is for taxable income. If the form is not filled in you can leave it blank. See the links provided by AmyC above on boxes 5 & 6. "Box 5 is the difference between the gross and the taxable amount. The amount being recovered this year, See here. Box 6 unrealized appreciation. See the rules here" If these do not apply and are blank on your form, you will leave them blank.
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