What was in the The Box? - Fnaf's Biggest Unsolved Mystery

Today we're taking a look at one of Five Nights at Freddy's earliest and most well-known mysteries. One that to this day has not been solved, or forgotten. But, is there a way to figure it out? Well, let's go through the options and see if we can pin-point what it might be!... And my extremely biased take on what it actually was.
Let's see...

Music:
Sonata for the Fallen - Ultimate Custom Night
Twisted Birthday (Slowed) - Help Wanted
Princess Quest - Help Wanted
Stanky Trumpet Music from Dayshift at Freddy's

0:00 What was the Box?
1:47 The Secret open box in Fnaf World
2:13 The Many Lore Changes & Retcons in Fnaf 4
3:12 Scott said what was in the Box changed
4:14 Option 1- Afton's Trophies
5:38 Mini Option- Crying Child's Body
5:59 Option 2- Fredbear Plush & Radio
7:18 Mini Option- Bullies' Masks
7:49 Option 3- Charlie Emily
9:13 Option 4- The Mimic
10:39 Option 5- Freddy's Pizza Place IS the Box
12:17 Option 6- What I think was in the Box
12:50 Who was the main character of Fnaf?
13:34 The Importance of the Puppet in Fnaf
14:13 The Puppet Retcon- Save Him to Save Her
15:04 The Puppet was originally the Crying Child
17:06 The Box is a Ventriloquist Dummy Trunk
18:14 The Puppet was in the Box
20:23 Why the Box was Never Opened