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Although the precise circumstances surrounding the makers’ loss of their map are not given in the Harry Potter novels, it is easy to conclude that they eventually over-reached themselves and were cornered by Argus Filch, probably on a tip-off from Snape, whose obsession it had become to expose his arch-rival, James Potter, in wrongdoing. The masterpiece of a map was confiscated in Sirius, James, Remus and Peter’s final year and none of them were able to steal it back from a well-prepared and suspicious Filch.