I had to rewatch the Fnaf movie for a third time, but it's there! The puppet is hiding at the top of the ceiling in the very corner by Chica. And at the very end of the credits, there is a voice spelling out "come find me" with the puppet's music box creepily playing in the background. Like the voice in the mini-game "Give Gifts, Give Life". So this might be hinting at some stuff for the second movie. If you don't believe any of this, then you should just skip to these parts of the movie. I dunno just thought it was cool-
https://youtu.be/AHjaNzaUqQo?si=oCJkwjwf6NbL7TDh Link with a video showing the "come find me" thing at the end of the credits