Several million Apple device owners received a check in the mail from a class action lawsuit. While it looks scammy this is actually a legitimate settlement - however the claims administrator has some serious issues with their data and many checks are incorrect. The administrator provides a short window for corrections which have to be filed in writing via the mail.
Update
One of the lawyers handling the "Apple Replacement Device Lawsuit" responded to some of the questions we had regarding incorrect checks and how they notified members of the class
Update
One of the lawyers handling the "Apple Replacement Device Lawsuit" responded to some of the questions we had regarding incorrect checks and how they notified members of the class