The audio evidence of contact is right here. So is the visual. This is a short clip found on the NASA web site from the Apollo 15 mission to the moon.
Journal Text:  122:44:24 

 https://www.hq.nasa.gov/alsj/a15/video15.html#station2

http://www.lpi.usra.edu/resources/apollo/search/feature/?feature=firsov&sort

Watch also.

Apollo 15 Smoking Gun – Astronaut Says “Whoops”
The Apollo 15 astronaut David Scott accidently catches a UFO hovering on his camera while on the lunar surface. You can easily hear him say the word “whoops” very quickly. The nine seconds of awkward silence at mission control in Houston adds to the suspense of what just happened.