I understand that advances at LHC rely on a huge amount of people and it would be cumbersome if everyone was fighting to get on papers rather than contributing technically. But once you get above a few hundred authors - outside the team that might understand and care what the paper is about, I'm not sure I'd value everyones or anyones contribution, if I was hiring that person into a new research position
Perhaps its lucky I don't work in physics funding or recruitment.
We have an internal database that keeps track of who contributed where. So in practice when someone is making a hiring decision, they find someone who works on our experiment, and that person asks around or accesses the internal database to see if the candidate really did everything they claimed.
Perhaps its lucky I don't work in physics funding or recruitment.