Has anyone ever done a oil change and not changed the filter? (since the Second World War ended). I know some odd repair policies existed during the war years. I could not be easily convinced to do this, perhaps when tied together with some repair but I can't think of a circumstance when I would remove and replace the oil but not change the filter.
For the OP, Have you run your question by Toyota? like the owners manual they are the people to ask,here at Car Talk we can only speculate.