https://abcnews.go.com/US/gun-rust-shooting-fired-pulling-trigger-fbi-report/story?id=88311336
Well, no surprise here for any of us with any experience with firearms.
That said, it shouldn't mystify us why investigators put in the time and effort to confirm what we already think we knew. There's always a tiny, well less than 1% chance that there could have been something defective with the firearm.
Still, I don't recall hearing anything resembling Baldwin's claims happening.