If one's earnings from labor have been filed with the government on a W-2 form, which declares them as federally-connected, which form does one file to declare that they are not?

Form 4852 is titled Substitute for Form W-2, Wage and Tax Statement, or Form 1099-R, Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc.

By making this form available the current tax code preserves your ability to correct any erroneous declarations by third parties that your earnings are federally-connected. But the government endeavors mightily to obscure this fact in the tax code, in the instructions for the form, and on the form itself. Filing the form for this purpose is discouraged although it is plainly legal.