I've never had a peep from any dragon inbound; rarely have even seen one at the entrance. Outbound is an entirely different animal (dragon) and they are hyper vigilant to check each pax for entry. But, again, only once in many years have I been told to fill in my info prior to entering the area. None of the airlines I've received a pass from recently, the preponderance of which is PG, fill anything out so I'm almost always showing up with a blank card and, save that one time, all is fine.

Two years ago I was trying to burn through some older UA cards, after the airline pulled out of BKK, and there was no pushback. Now it seems the agents are checking the flight against the card's issuer so I wouldn't attempt it. But the difference between the old TG purple vouchers (which are no longer accepted) and a two year old CX pass are like night and day.

Not that I'd recommend tyring your luck with the old purple vouchers but if you wanna try I've got a handful I'd be willing you give you gratis.