The only places that this information would be available would be in statements from your employer plans and possibly supplemental information on paystubs from these employers.
Although you might be curious how much employers contributed as the employer matching contributions for the purpose of determining investment performance over the years, that information has no bearing on determining the taxable amount of any distributions from your IRA. You might just consider employer contributions as being a part of your investment performance since you would not have received employer matching contributions had you invested the money elsewhere.
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