On the [Manage Inventory|https://sellercentral.amazon.com/inventory/ref=ag_invmgr_dnav_xx_] page there is a column called ‘Buy Box Eligible’. If you do not see it, simply click the ‘Preferences’ button at the top right, scroll down the list of attributes and check the box in front of ‘Buy Box Eligible’. Then click ‘Save Changes’ at the bottom of the page. If you see ‘Yes’ in this column for the product, then your eligible. If ‘No’ then you are not eligible.