In my experience of collecting from away grounds (when tickets haven't arrived in the post) they only put the lead bookers name on the envelope and ask for their ID. Although they say each person needs ID. I collected one I'd bought using my dads ref for a game earlier in the srason for my son, I just walked in gave my last name and they handed it over. I was a bit worried I'd have to pretend to be 20 yrs older and make out I'd just lost my wallet or whatever, but it was all fine. Each time I've had to do it (probably 5 or 6 times in the past few seasons) theyve never asked for ID and it's been my name as the person that booked rather than references of other ticket holders on the envelope.
Having said all of this I can see why you'd be reluctant to travel to Cardiff and risk being turned away. .