If what you are looking for is what I think it is ... there is a door in the store which has what you are looking for.
I haven't heard that one before. If you have not done a lot - I would quit and restart and see if that fixes it. I don't think you can play it directly from the zipped file, but if you are, you should unzip the game onto your hard drive to play.
If neither of those do it, delete the game and unzip it again, try again. If that doesn't work, delete the game, turn your computer off and on again, unzip the game, try again.
Also, when you are trying these, make sure you do not have any mods running. I think the only mod is the gallery unlocker - but I could be wrong. Either way, if you are trying to troubleshoot - always start with a clean install. If you aren't using mods and this still doesn't help - sorry. You could ask again with screenshot(s), just so we can see what you see.
You may think you actually placed them, but just to be sure (from walkthrough on Mejoress): Priscilla's house (plumber outfit) > place the 3 cameras > 1) bathroom/shower > 2) Priscilla’s room /big wall mirror > 3) round footstool/chair to the right of the room
Screenshot(s) may help us if you still have the problem after double-checking.