In the search bar of the BuyBox analysis you can enter the ASIN you want to analyse.
The ASINs you have already created in Product > Settings are displayed in the BuyBox analysis. In the table, you can see the product title, the average star rating, the price and the status of the BuyBox.
If you see an X in the "BuyBox" column, your product does not have the BuyBox. If you see a check mark instead, your product has the BuyBox of the listing.