I have mostly good news. It's probably too late for the original posters here, but may be useful for people who've found this thread while searching for info, which is how I got here.
About a year ago I got a couple of large cans of Similac (and maybe a diaper?), which was obviously just a sample meant for new mothers. The mother had moved elsewhere before my family moved in, and I didn't have an address to forward the sample to. The cans were obviously factory sealed like you'd normally buy it, so I had absolutely no reason to be suspicious of anything strange happening. I didn't take note of the return address, but you'll see why it's pretty clear it was the one we're talking about.
So I kept the baby formula for myself, in case I could give it away. I hate to waste good stuff! In fact I ended up using it to supplement my own nutrition while being on a crash diet. (I know this part of the story's unusual, but that's beside the point!) I used it like creamer in my coffee, and it lasted two or three months. No problem! (My diet's been a huge success, btw.)
Now, last week (which is about a year after getting the package), I get this bubble-wrapped envelope in the mail that says "TIME SENSITIVE MATERIAL" on it, addressed the same person who was an occupant years ago. I had no idea what was inside, so instead of opening something that might be private, I looked up the return address on it, and found this thread.
Aha! It's obviously something connected to the previous Similac package, or at least it's related to the same mailing list that probably tracks to pregnant mothers. I have no idea if Creation Science had anything to do with the mailing list, but the mailings themselves in no way seem suspicious to me. Perhaps it's just a nosy group of pro-lifers somehow getting names from local hospitals? Or it's Abbott, makers of Similac. I have no idea.
Anyway, after deciding that this latest mail wasn't private correspondence, I opened it. It was a letter from Abbott about a formula recall, and it doesn't even pertain to the sample I got a year earlier. I'm slightly suspicious of who mailed the letter because it looks like an inkjet printout (and actually looks to me like a scanned color copy), but I'm NOT suspicious of the intentions of the sender. I'm pro-choice, and I still appreciate this letter, even if it happens to be from a pro-lifer or someone otherwise connected to Creation Science.
Whoever it's from (which might even be Abbott, or a group officially sanctioned by them), I'm not suspicious of their good intentions. (To repeat the letter's return address for search engines here, it was PO Box 29178, Shawnee Mission, KS 66201.)