Capital Gains Partial Exclusion

My husband lost his job in November 2022.  He collected North Carolina unemployment for about a month, and then found another position in Michigan - started December 2022.

 

We had sold a home previously in NC in July 2021 and excluded the gain. We purchased a new home on the same day.  

This home was our main residence for 19 months - we sold it in February 2023. 

Since we moved 761 miles  - I am assuming we qualify for a partial gain on the exclusion.

My question is - where if anywhere does this get reported?  Do I just need to keep documentation in case of an audit?  I have his offer letter, unemployment papers, and the quote for the cost of the move.