Can you point us to an incident where this has ever happened, namely, where a service provider didn't to respond to a demand immediately while they verified its authenticity and someone went to jail for it? Or even got a finger wagged at them by a judge? Third-party records production is almost never time-sensitive to the degree that, say, a warrant to search for drugs or contraband is, and there's little risk of spoliation of evidence.
You cannot conclude that because someone has been held in contempt for intentionally failing to respond to a records production request because they simply didn’t want to do it, that someone would also be held in contempt for delaying production for a few hours while they make a good-faith attempt to verify the authenticity of a request. Judges take all the facts and circumstances into account—including intent—when making these kinds of decisions, especially those that involve depriving someone of their liberty.