No, 401k contributions are not reported on Schedule D.
If you entered any information on Form 1099-DIV, there could be a capital gain distribution reported in box 2a. If there is an amount shown there, then it will be reported on Schedule D.
To answer one of your original questions, having a balance due does not directly relate to needing Schedule D for capital gains and losses.
Also, you should not simply delete the forms from your return if the income was reported on your Form 1099-DIV. Not reporting the income is likely to cause a mismatch within the IRS system and could result in you getting a letter requesting that you pay additional tax for under-reporting your income.
@cbernabel
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