Before I delve into my question, I must first commend the author(s) of the TOT list. The Magic Key Mansion came with far more pieces than any other PP set and they have done a beautiful job of cataloging the parts.
That said, I question the TOT Magic Key Mansion parts list on whether part number FPT17146 really exists. TOT says the part is a, "Small white 3-sided decorative door frame that snaps onto the inside front door opening on the FPT17129 mansion walls. The back of the door frame has 4 small raised pegs (2 on each side that snap into the 4 tiny holes around the inside front door opening. Measures 1-3/4" wide, 3" tall, 1/4" thick (including pegs)." Another way to put would be, it is a door frame that goes on the inside wall of the kitchen around the front door and fits into the tiny holes pictured here:
Why, you might ask, if the piece doesn't exist, would TOT have it on its parts list? I think that perhaps someone saw the holes in the kitchen wall and assumed there ought to be a door frame that fits over them. Makes sense, but I think an equally reasonable explaination would be that those holes are merely the back sides of the the holes for the door frame that does go on the outside of the Mansion front door.
So here's where you get to chime in. Do you have a Magic Key Mansion? If so, does it have a white snap on door frame around the inside of the front door? Please let me know. I'm interested to find out if I am right about this or not. Thanks!