"The Monuments Men" should work, as that is the movie's name, not just "Monuments Men" (at least according to IMDb). However, I do confess to being an idiot -- I mean, why couldn't I just try it without the "the".
I was hoping to see the one in which he made his film debut - Mystic Pizza. Not a big role, but I still remember his single line when he was eating a lobster, "Mom, do you want my green stuff?"
He was also in The Good Mother (1988) and Field of Dreams (1989) as an extra. The Third Wheel (2002) as a cameo. His role in The Majestic was a cameo as well. He was also in a deleted scene in Ocean's 8 (2018). Jay & Silent Bob Reboot (2019) should be red cause Affleck is in that as well. Also if you're including Behind the Candelabra (2013) then you should also include Rising Son (1990) and The Good Old Boys (1995), all three are TV films.
Alle films Matt Damon!