You should keep this for your records.
If you do hear from the IRS, you will have to respond and let them know the sale was for your personal residence and explain why it qualifies for the exemption.
If there is any uncertainty for you about whether you do qualify for the exemption, the article below will help clarify this for you.
https://turbotax.intuit.com/tax-tips/home-ownership/tax-aspects-of-home-ownership-selling-a-home/L6t...
