The golden freddy scene isnt unlocked on cam 3 ive tried like 4 times and it just crashed my game, but im pretty sure there is a scene if you beat 1987 mode on custom night and its probably golden freddy
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You have to click on the poster when it changes. If you notice, when you go back to cam 3 repeatedly, the poster on the wall changes. You just have to wait for it to change to Golden's freddy's face and then it changes. If you want the other golden freddy scenee, you have to set the custom night's difficulty to 6969, and she jumpscares you.