<p>Kryptonsa36 is correct. Obviously, you can’t open a sealed letter, but if a professor shows you a copy of the recommendations, I don’t think there’s any harm in reading them. One of my professors gave me a copy of the LOR he sent. Now, if I later get accepted to any of those schools, I can’t ask to see the letters outright, but since the professor gave me a copy ahead of time, it doesn’t really matter.</p>
<p>To the OP - I think you’re fine. As others have said, the schools will likely contact the professor if they have any issues with his rec.</p>