I bought mine off of StubHub and UPS just dropped them off. They don't look like the fancy ticket from earlier in the thread. They look like a regular ticket but do have a hologram with the NCAA symbol and the word CHAMPIONSHIPS in it so I think they can look a couple different ways.
My tickets from StubHub also came in the mail today that look like Ticketmaster tickets and have the NCAA Championships hologram on it. I think it's legit, but it is nice to have the StubHub Fan Protect Guarantee for a refund if not.