Let's get rid of the media hype: a general survey on holiday habits doesn't really tell us when people check their identity documents.
It is fanciful to suggest that this explains the document verification behavior without a specific question in the survey.
In Germany, no one would make decisions based on such conjecture for real investments, like document recalls.
If the survey didn't directly ask "When do you check your passport?", the practical value of this "information" is minimal, as it doesn't change how we act.