Right, that's typically the way registration pick-up is handled.

If the reg staff person knows you, they hand you a badge. Occasionally, at cons where underage drinking has been an issue, I've been required to show a photo ID in order to get an "OK to drink" mark on my badge. That's silly (particularly when the person is obviously over 21), but...

If the reg staff person doesn't know you, requesting a photo ID protects attendees, so I've never objected to showing photo ID in that case.