Just ran the serial on the rMBP I just bought. I'm getting this: Please validate your product's purchase date. Apple is unable to provide information about your service coverage. Please sign in with your Apple ID and provide your product's date of purchase so that we can display your coverage information. I don't know the date as it was used, purchased on the secondary market. Legit guy, just assumed he never registered it as it was still in the box (no, I highly doubt it was stolen). Thanks!