I've come across this approach many times, where they ask a very specific question knowing (or at least being very sure) that you won't be able to provide something that doesn't exist, so they can have their big "a-ha!" moment.
Archetypical example: the missing "master tapes" of Apollo 11.
Never mind that they didn't even know the tapes existed prior to their reading the story of the unsuccessful search for them.
Never mind that they don't know how they were made, why they were made, or that they were never played back, yet everyone still saw the EVA -- which kinda defeats their use of the term "master tapes". A more accurate term would be "backup tapes", as they were made solely in case a scan converter failed. That didn't happen.
Never mind that not even NASA could foresee that new technology would someday make these tapes useful in making a better quality video of the EVA. They're NASA, so they should be able to accurately predict the future for at least 5 decades.
Never mind the extraordinarily abundant record of the Apollo 11 mission, and those that followed, including direct video recordings from the greatly improved TV cameras on those missions (after a much less lossy conversion from field sequential color to NTSC). No,
that was all faked. Why? Because it exists. Those tapes --
only those tapes -- contained The Truth. Why? Only because the hoaxers know they know longer exist. No other reason.