"Axios, citing unnamed sources, reported that Musk has complained that Epshteyn, a Trump adviser, had too much influence in his recent picks, including the controversial selection of Matt Gaetz for attorney general."

The Unnamed source may have been given bogus information to identify them as a leaker.

Say I think Fred from accounting is leaking formation. Tell Fred or let Fred overhear unique and bogus information. If that information pops up somewhere in the media, fire Fred or use him to float more bogus information while sharing nothing of value with him.