Definitely not as fancy as the NOA. It's not an I-797 notice like the others, but I read in the May filers group I'm in that someone else got something exactly like this, so I'm not worried. I'll definitely be glad to have the green card in my hand though!
Just a note: my case status on USCIS's website never updated throughout this entire process. The last update is that on May 2nd, they received my petition. And when I sign in, the "last updated" column is still 5/10/13. So, their site is definitely not reliable, lol.
Also, if you notice, the decision date of my approval is 8/29, which is the day before I even sent my second response. So it seems that USPS actually did deliver my initial police record search to them. Apparently it was just not scanned properly, thus the system never said it was delivered. Hopefully the second response won't cause any issues. I did note in the cover letter that if they did indeed receive the initial response to simply disregard that second copy. But, who knows with USCIS, lol.
I'll update again once I receive my green card. Hopefully it will be just in a few days!