ccs m45a1

I am getting a CCS M45A1 Black/Grey variant. My question is...why did Colt offer pelican cases with some but not all M45A1s? What is normal 20 LPI or 25 LPI front checkering? I haven't received my CCS M45A1 yet...but I've read somewhere that Colt sometimes forgot to stamp the CCS M45A1...