Batboard

I've noticed lately that there appears to be 2 different color sets of buttons for the 3 buttons that are directly under the XTS5k display (the buttons with 1,2, and 3 little dots on them)

I've seen ones with the Blue dots, and ones with the Purple dots.

Is there any reasoning behind this? Has anyone else noticed this?

Purple = Barney's XTS5K

Blue = Cookie Monster's XTS5K

Who knows - probably just a different batch of ink?