Wow. Those 500's came out great. I only have one barrel of 500's unfortunately. I was late to the game, so I feel lucky there was anything left. I got extra racks of the 1A's along with my secondary sets though.
if you plan to overlabel, the new label will be almost flush with the chip face. Milling is not required in that scenario. If you plan to keep the existing aethestic with a small lip or recess, then you will need to mill the chip to accomodate the larger label.