I have never seen anything that would require you to keep up to date information on a model - only information up to date at the time of filming. However, that is one of the reasons why it is important to execute a new model release each time you film (plus is shows consent for each episode you shoot). It means that if address info changes, you will get the latest info.
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grandmascrotum: The problem is you are required to store the original image. The model release traces back to the original HARDCORE image, not to your new "cropped" image. Under that logic, a CP image of a naked 14 year old cropped would suddenly jump the fence and be legal... even if the underlying image isn't. Not exactly sure how that would work.
DVD box covers as a whole are a work of themselves, but they too have models and source images and so on... I am really not sure where the line gets drawn, but I can say without a doubt: When you are not sure, err on the side of being sure.
Alex
Alex