You can only escalate and ask Ebay to step in through an opened case.
So, you do need to find a way to add at least one photo to your return case.
It does not have to be a photo you have taken.
You can copy and paste a photo from the original listing so you can submit the return case to Ebay.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)