Sometimes I wonder if hospital's L&D shares records with anywhere else. I mean, that mailer would come from L&D, and they might not have gotten told you had a loss. Stupid people. Call them and yell at someone.
On the DAY that Cora would have been a month old, I got a coupon package from enfamil titled "Cuddling your one month old." Um, yeah, how's that for a knife in the gut? Even though I called, I got one a month for the next 6 months. And I called after every one. After the 6th one, I finally yelled at the guy and told him that she had been stillborn, and I had called to get them to stop mailing me every month for 6, and they hadn't stopped and I didn't appreciate the monthly reminder that I didn't have a baby, and I probably wasn't ever going to buy enfamil because of it. He was very polite, and I never got another one again.
So, yeah, call and yell at someone. It'll make you feel better.