I have a phobia of all things glossy that claim to explain mechanisms without providing concrete evidence.
Just because a survey was conducted doesn't mean the results explain why people verify their documents early or late.
A survey on planning habits, even with 78 responses, proves nothing about the deep motivations for identity document control.
For example, knowing that 75% verify in advance doesn't explain whether it's out of fear of fines abroad or simply out of habit; without these details, no real change in behavior can be anticipated.