Oberg noted that the claim that NASA and the astronauts tried to hide or cover up the mystery is false. Not only did astronaut Michael Collins report the same sound on Apollo 11, he described it in his 1974 book "Carrying the Fire: An Astronaut's Journey."
According to Oberg, "The noises were discussed in real time by the astronauts over radio links that were broadcast live, and in more detail by the crew during debriefings back on Earth - as they should have been, as a fundamental safety principle of examining all anomalies for indications of threatening malfunctions."
The idea that the astronauts discussed whether or not to tell NASA about the sound is nonsensical, since all their transmissions and conversation was being recorded. The discussion was not whether to engage in a conspiracy to hide what they heard (as Oberg notes, it was being broadcast live, and in any event even if it weren't NASA would find out sooner or later when the recordings were reviewed).
Instead, the discussion was whether the odd sound might indicate a severe enough communication problem that Mission Control should be notified. Though the Apollo 10 recordings were classified at the time (per standard protocol), they were eventually released in 2008; if NASA had something to hide, why would they have declassified and released the recording at all?