The content of this article is derived from notes and drafts of the Harry Potter books/films/games that were cut before being released. As such, the contents of the article may or may not be considered canonical.
It is likely that the Muggle would have given their location willingly, as Rowling described them as a "horrible Muggle" who betrayed them in a similar way that Peter had, rather than someone who was made to by means of magic or threats.
Since Voldemort had hated Muggles and Muggle-borns, it is unknown why Rowling originally wanted a Muggle to betray the Potters for him. It is possible that they had no idea who he was, but just wanted to cause trouble, while Voldemort saw them as a means to his plan.