Here is a simple look at how the het to het works. This is how all hets work but I used piebald for the example I made here.
This basically shows your odds of what you will get when pairing het x het. As you can see the NN is a complete normal with no het (1/4), the two Np are the normal het piebald (2/4), and finally the pp is the visual piebald (1/4). As specified by John, that means that all the normal looking babies would have to be labeled as 66% het piebald as you can not be 100% sure which are het piebald and which are not without holding them back and proving them out.
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