Look into cam 3 (the closet). Sometimes, the poster will be one of golden freddy's. That's rare.
The fastest way it to enter the code 6969 into night 7. (I recommend trying the code 1987 before 6969)
Viewing post in 🔞Five Nights at FuzzBoob's: Definitive Edition comments
To be clear, you enter 1987 in night 7 by setting the difficulty of each character accordingly. (Freddy at difficulty 1, Bonny at 9, Chica at 8 and Foxy at 7). You unlock night 7 by beating night 6.
The only reason I tried 1987 is because it was an easter egg in the original game.
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In night 3 or 4, they tell you a bunch of parody dates. The sounding of 1983 (?) is a third code that gives you plushies. I don't remember the year of the event, but it's the sounding one.