The Serpent or the Egg?
Top Left Photo is my enhancement of Norman Muller's original, which can be found here:
These are my photos:
The correct answer is: We don't know.
We don't know if the Egg Stone was already there.
Except for that last photo, maybe.
But that's a trick question. If you look at that last Serpent, nose to nose, there is no Egg:
Step over to the Serpent's right side and there is still no egg and the Serpent has closed it's eyes: