Just want to add my voice to say I'm about 99% sure it's the old organics. I had a whole stash of them and they had the dark cotton like that. They also didn't have the Cotton Babies tag. And they were made in the USA. I still have a couple that I can check the wording on. If anything, the dark cotton to me just confirms they are NWOT. They lighten up a lot just during prepping. Honestly, I wouldn't even waste CB's time asking about authenticity.
Rebecca, married to J (2007), DD1 Anna (11/09) and DD2 Ada born at home 7/12 DS Henry born at home 3/14