I don't know about Universal but we went to Sea World last summer and bought e-tickets before we went. I think the paper was our ticket. I don't remember them trading it for a "real" ticket. We stayed at the Hyatt and took their water taxi over so we weren't at the main entrance but we just showed the guy at the dock/gate area our paper and he scanned it and let us in. I'm not sure if it was that easy because there was only one guy there. Now that I think about it, the main entrance might be different. Sorry that wasn't more helpful.