I'm not sure I understand. Lots of people report these experiences. Are you saying that those reports are all dishonest, that people who report them didn't actually experience what they are reporting, or something else? In any case, there is certainly a major issue with the fact that these reports have a circular effect. People report that aliens look like this, so people believe aliens look like that, so people report seeing more aliens that look like this.
OTOH, a number is a mathematical concept, not a physical object or phenomenon. But it can easily be represented in video. And an audio recording of red is fairly trivial. Red has a wavelength (640ish nanometers). We can record that wavelength. By converting the EM radiation wavelength to physical oscillation wavelength, we can play it back. It's outside of human auditory range, of course, but if you want you can choose to translate the human visible spectrum to the human audible spectrum pretty easily.