Wow, I'm astonished at the stamina displayed in this thread, sincerely. I gave up pages ago.
One thing I'll reiterate because I believe someone touched on this... a ton of caulking globbed on to the top of the toilet where some sicko is going to introduce a peephole is the perfect cover. It makes it look like shoddy repair work. Btw, the reason I'm willing to make the assumption of motivation to obscure a peephole in that manner is because if true, the sicko actually peeping isn't of sane mind already. Not a big leap to think,
"I'll just glob a bunch of caulk and people won't think anything of it." A hole going all the way through 2 different layers of hard material in that place makes no sense without intent. It's almost the equivalent of a floor mounted toilet with a hole behind the tank, just above the tank line. Tiles and the board behind just don't wear out into a hole just above the toilet line without some logical cause. Keep in mind, years of heavy individuals sitting on the fixture wouldn't break the wall. It could damage the mounting bolts that go through the wall, but they're essentially different systems. Think Yeti, rollercoaster, and mountain on EE. They're 3 different systems that intertwine, but are separate. Any substantial damage and sagging of the fixture would break it right off which would require much more substantial repair than just remounting a new fixture. Or, more likely "caution" tape closing that one stall and ignoring it for years.
If you're suggesting that a previous fixture was in place with different dimensions could've caused this, let's set aside the improbability of the new fixture aligning properly for installation without being the same dimensions/model without extensive changes to the wall. What proof is there? You're assuming something for which you have zero evidence and is very unlikely. Assuming a peephole on the other hand, not such a big leap considering there's a hole in an unlikely place for a hole for which you can see clearly into the area on the other side. Evidence of the possibility is right there. Okay, assume that part of the tile mysteriously broke away due to some unexplained bad repair work... explain the hole in the wall that makes no sense in that place? There's just no evidence without a cause of what might have created a hole through the wall if not intentional.
I actually heard it was room 1408 at The Dolphin. Weird!