Sorry, I've been very busy with work lately. I'd like to correct some misinformation.
Whatever we got was definitely not anything other than the 0.015" cutter. They may have ran the cutter twice (making two identical cuts) - or just straight up the same as the prototype. I can tell you this without even seeing the prototype. Just look at the difference between my moogle kit and the RGB kit - it's massive.
A very quick and dirty image comparison (prototype from Melissa = white key):
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Still not convinced? Invert the prototype image (As ripster has shown, there is a slight optical difference between the white and black legends)
But, does the 0.015" look pretty damn good? Sure it does. I don't think anything differently needs to be done - atleast for now.
But, please, please don't be talking about a 0.019" cutter... that's just silliness!