Mail was sent from 62.76.188.230, casascius.net resolves to that IP address.
This is confusing. The spammer is warning about himself?
Maybe he's switched to troll mode now and is replicating the warning email so people flame about casascius spamming?
Oh, whatever. I just got two of the physical Bitcoins, they're awesome. I'm considering buying a bunch of them, so the fraudster site was really dangerous for me. So I appreciate the warning (even though I never received it per email).
Think about it this way: between an advantage of a fraudster or casascius, there is no doubt what should be put preference. These physical coins are a huge marketing boost for Bitcoin, it would suck if a scammer were to ruin that business.