I believe I got the credit card opt-out notice in the mail. I was suspicious because it came for really no reason. Also, it listed four credit reporting agencies instead of the main three, which was suspicious.

But yes, I do seem to remember calling a number and reading off every last speck of personal information in my life. I was terrified that it was a scam and all my over-caution, paranoia, and downright vigilance for privacy was being undermined by my desire for it. I swear I kept a record of it.... I'll have to check against the link you posted. Thanks for that.