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The Keyless Entry code may or may not be on the back of the Smart Junction Block located under the dash on the drivers side. It is just a tag that is put on the back and and have been taken off at some point during the life of the car. The onlt other way to get the code is to have the dealer hook up the scan tool and retrieve it for you.
Yes, That is the box you are looking for. It has many connections going into that do lock in. This is the Smart Junction Block. You will have to unbolt it and take a peak behind it and see if the tag is still on it for the keyless entry.