I don't know how it is on this forum, but on many other forums you cannot delete the first post of a new thread. What would happen is the whole thread could then be deleted by the originator including replies of other members.
In the case of an item for sale, both replies would be correct, you can either edit your existing post, or make a new post stating either the item is no longer for sale or it is sold and to please close/remove the thread.
If a mod or admin does not pick up on it, a pm to one of them should take care of it.
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