You know what Sam?
You guys should do
SCP-055.
It's really simple actually, no model, sound, anything needed.
Because the subject simply cannot recall the object, I think the only thing they would remember is entering the containment chamber and leaving it.
So it would be like a visual portal mirror:
The player looks into the containment chamber and actually all he see's is the door he just came in through, if he walks up and through that door he simply winds up back outside the containment chamber.
Heres a crappy gimp paint dev view of the theory:
Orange dot is the player, looking into the visual portal.
Player looks through the door, gazes into a mirror/portal that essentially reflects the room behind him excluding himself, as if all he remembers is entering the room and leaving it. Walking up to the visual portal puts him 180 degrees back around to where he just came from. A sort of paradox.