I found this picture online in here.
I want to confirm the authenticity that these are real mother boxes and if so how come Steppenwolf is already in possession with them.
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Yes these are the mother boxes. Though this is not the real Steppenwolf or the real mother boxes. This is just a premonition scene of whats to come that Lex witnesses. It sets up that Steppenwolf, or some creature atleast is looking for the Mother Boxes.