Do I need to purchase the Online Pass even though I bought it new?

When I went to check out the co-op play option but it says that I haven't purchased the Online Pass and therefore cannot use it. I know that online passes have become more popular in the past year and often require a separate purchase if you buy the game used/secondhand, but so far the precedent I have seen is that you get an online pass if you purchase new.

I have purchased Saints Row: The Third brand new (the Platinum Pack even). It didn't seem to come with any separate Online Pass code that I can find in my box. All I had was the code for the Professor Genki DLC.

Do I have to purchase the Online Code separately even though I have a new version of the game? Is it possible my box was just missing the code?

No, you shouldn't need to purchase the Online Pass if you bought the game new. A post on the official site confirms that the Online Pass should be included with any new game.

Inside your copies of the game will be a code to enter on your console in order to play Co-Op with a friend.

Either:

• The code is in there, and you haven't found it. Check the back-side of any papers, manual, or the fold out instruction booklet.
• The code is bundled with the DLC pack (can't tell from wording on the above post).
• The code is not in your box for some reason, in which case, I guess you should contact Volition, or the store you purchased it from.