I am trying not to change any vanilla content so I did not follow this specific suggestion. However I did the next best thing.
HermsFoodStorageRef was set up with a merchant, Hermatha, who has 24/7 service offering of all items (clothes, spells, food, et cetera). After the item is added it is visible in the HermsFoodStorageRef container. Hermatha's sell list does not update though. Hermatha does not have "ownership", but this container is her assigned merchant container. Hermatha sells everything in container assigned to her through merchant container options, except the wine when it is added.
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@Trollf
I did another test after reading your bit on container ownership (not merchant container assignment). It does not effect a merchants ability to sell items from a container, neither in a positive nor negative way. As for the other things you mentioned I double checked, and none of those options are set incorrectly.
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As a player in game, I tried leaving an item in the container. Hermatha did not then sell said item. I think this conclusively proves that the sell list isn't updating. I tried zoning in an out and waiting to see if that would reset the sell list. No effect.