Thanks - called Chase this evening and asked how to apply the source code for my recently acquired Marriott Visa and the rep asked if it was the 50K source code. Once I confirmed it with him he said it had been applied. This was the second rep I spoke to as the first rep transferred me once I describe my issue/question.

I will confirm after my first statement to ensure the points are credited to my Marriott account (it appears the bonus night already was).