With 'standard' commodities it's possible, albeit not really obvious and intuitive. But, if you didn't overlook something, that's really daft. On the positive side, you don't have to fear anything since you don't seem to have them stored anymore (your potential customer will hate you for wasting his time though). Otherwise, if still stored on your carrier, it should be possible to manually deactivate. From what I can see, the carrier doesn't remove sell orders after the items are sold out, so that you have to do it manually (or just ignore and anger your customers), which I guess isn't possible with non-standard items that aren't listed if not in cargo. Not quite sure if I really understand your problem though...