Color correcting auto white balance footage

I shot some video yesterday and at the time of the shoot, I made sure to set my white balance, however after looking at the footage I notice the color temperature slightly shifts constantly. I don't know why this happened, but it's too late to investigate, my project is due in less than a week.
The good news is that I've realized that that there's a white object in the bg of the shot the entire time that is pure white so i could color correct by setting that as the white point in FCP. The only problem is that since it shifts every 3 seconds or so i would have to keyframe a LOT. Is there any plug-in or application that will let me track that white object in the background so it can set a custom white points for every frame?
Running Final Cut Pro 6.0.2
PS: I found Avid has auto color correction -- basically what I'm looking for I guess. Unfortunately I don't have Avid.

there's no auto color correction feature directly in FCP
there are 3rd party plugs to allow you to track objects but i'm not aware of any way to link that to a color correction

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