Why wasn’t the Severed floor completely set up the day before?

Lumon had expected Mark to come in the day prior to the day he came in. Wouldn’t they have had to have the giant Mark mural hung up expecting his arrival the previous day? Likewise for the kier animatronic in the MDR?

These were set up to be found on-arrival in the final episode, but wouldn’t it have been set up the day before when mark had been expected at work? Helly would have encountered the Mural at the very least.

Edit: Helly acted as though she hadn’t seen it before. I believe that she must be faking, or this would be a major discontinuity.