The solution
There are two viable options; one is definitely preferable.
Simply take any such item down before photos, before showing the home, and definitely before signing a contract. Put it in a box and be done with the matter. This is my preferred option.
Alternatively, a seller could exclude them in the contract and then remove the item anytime before closing.
If the item will be taken down at some point, why risk making it negotiable?
If a buyer sees it, she could decide she loves it and refuse to buying at the asking price unless the item in question conveys. This simply would not have happened if an equivalent item were in its place.
Just remove it before the marketing photos are taken and save yourself from a potentially contentious moment.