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A basket is always related to a specific conversion, therefore, you will have to find the conversion to which the basket belongs first. Make sure you are logged in to your admin UI and click on ‘finance’ in the main navigation menu and proceed to click on ‘conversion’. As soon as you have found the conversion you are looking for, click on the icon in the outmost left section of the conversion panel. If you do so, a panel with all the basket positions related to the conversion will appear below the conversion panel.
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Please note the files you can export in this section have not been optimized for validation in bulk. To find out how you can export a basket file optimized for bulk validation, please read this article.