"The Sith Apprentice" (2005)
Brian made a cameo appearance as Boba Fett in this film, utilizing his own costume and props.

IMDB listing for "The Sith Apprentice"

"The Sith Apprentice" was given the "2005 Audience Favorite" Award from Lucas Film.

Brian's Boba Fett costume, as featured in "The Sith Apprentice"