Looks legit to me, too.
The missing corners are synonymous with $2 bills across all series and sizes. For some weird reason twos were/are considered "bad luck"and the way to break the chain of bad luck was to tear off a corner of the bill before you spent it.
I first heard that story from my Mom about 60 years ago! I still hear it today!
I wouldn't be too concerned with your bill and definitely would not tear off any more corners!