I recall a few being released in the 90’s in N. Florida. They were shot by some local hunters who didn’t really know what they were.
It’s not hard to tell what they are... Nutria are also huge rats and stupid enough to wander around in the daylight making were easy picking if the cover wasn’t too think. Capybara may be more nocturnal foragers. Not sure about that though. I saw a NatGeo Wild show a while back where the Louisiana National Guard was using Guard “sniper” teams, driving around the bayous at night, shooting Capybara as part of the control strategy. Looked like fun and a good use of tax dollars.