If I'm being honest you will struggle.
The only time I collected tickets I had to show my ID to get into the building and again properly when they checked the system before issuing. My payment details/card were never reviewed
I'm there and apparently it was a section of their hooligans that hate the Croatian FA so much that they want to get thrown out. French riot police knew it was going to happen 5 mins before it happened and then just watched. The fighting was between the above mentioned group and the fans who took exception to their protest
We managed to book 2 rooms in a F1hotel next to St Etienne airport for £22 each last week. No idea how as all the hotels have been booked since the draw