How do i know the basis of retirement income on a company sponsored IRA that was opened and closed in 2 moths by the employer

We need clarification.  There is no such thing as an employee sponsored IRA.

A qualified workplace retirement plan is created under sections of the tax law including 401k, 403b, 401a, and others.  You can only make contributions via payroll deduction, and there are a number of other rules the employer must follow.

If an employer wants to help employees save for retirement, but does not want to follow all the rules for a qualified plan, the employer can offer a Payroll deduction IRA.  There are key differences between a payroll deduction IRA and a qualified workplace plan.  The most important is that a payroll deduction IRA is your IRA–you are the only owner.  The employer can help you make contributions by payroll deduction, but it is your money.  All the money is taxable on your paycheck and W-2.  The employer can't add tax-free contributions as an employee benefit.  You can make separate contributions to the IRA from out of pocket funds.  If you contributed to a tax-deductible traditional IRA, you must take the tax deduction on your tax return, it is not handled automatically on your W-2 like a qualified plan.

https://www.irs.gov/retirement-plans/plan-sponsor/payroll-deduction-ira

So you need to clarify if you participated in a qualified plan or an IRA.  If it was an IRA, then whether or not you have a basis depends on if it is a traditional or Roth IRA and how you reported your contributions on your tax return for the year you made them.  You must report those contributions, the employer doesn't do it for you.