There is a website called ScottGames.com, were Scott Cawthon (The game's owner and creator)
Posts mysterious images and teasers.
One of the newest is:

And now, after a while of it being that, its this:
Hats off to Scott on this one! (See what I did there? hat? aww forget it...)

This has is sitting on a checkerboard floor (Aka a FNaF pizzaria floor)
and not the stage, with spotlights shining on it.
Major Questions
Who's hat is this?
Why did it go missing?
Is is symbolic of "Last one" or soething?

Well, first, whos hat is it?
If its pre- FNaF 1, it could be Golden Freddy's but I've seen Golden Freddy's
to be soewhat different from Freddy's and I think this one looks more like
Noral Freddy's. Notice it does not have the red stripe so it is not Toy Freddy's.

Why did it go missing?
I have no idea. Maybe it left to signify FNaF leaving, hopefully not.
This increase in teasers is sudden and it might mean there is still a
chance at a FNaF 4!

Is it symbolic?
It could be symbolic, Scott is a very tricky man. A genius, really.

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And if you have an opinion, please comment below!
(Please no "Your theory stinks" to anyone.)