My apologies, I determined why nobody noticed anything. Rossi borrowed Harry Potter's Cloak of Invisibility, or a Klingon cloaking device, or something like that. Makes perfect sense now.
I'm a little surprised by your comment given your past astute observations. Do you not understand the contention at issue here? There is no evidence on the record that nobody noticed the heat exchanger being installed in the mezzanine. Go read the record. Nothing. We have had very limited access to the deposition record so far. So any assumption that nobody noticed anything is just that.