took another look, and oh, dammmm, you’re right - the squares are there....
The only reason we saw the obvious fakery in the initial Oval Office pics was that they were rushed. 6 hours after President Trump left the Oval Office, Biden was there with cheap wrinkled drapes, a new carpet and wall paper.
Every day that passes has been an opportunity for them to improve their sets, their costumes their fakes. They do “fake” for a living so I’m confident they can do convincing fakes when given enough time.