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You need to have added the item to a collection before you can download it as a csv so you still need to have identified the actual release on the site.
I keep a spreadsheet system with the release numbers attached but I still have to look them up and add them to my collection. They then get listed in the inventory if they are being sold. Oddly though they don't get erased from the collection if they're sold. In fact it's very easy to run an inventory without having a collection. You see quite a few examples. Where there are only 10 or so of a release in collections but 20 offered for sale.
You can download the info from Discogs as a CSV which should give that.