Have you changed address since the orighinaI was mailed ? I received my second check a couple ? months ago ( slightly different amount than the first one ) and there were several threads on here and elsewhere with people confirming receipt at the same time. If I remember it was in a pretty generic "toss able" envelope ... Easy to miss. Easy to toss as junk ... No no no!
As to the "what this is about" question ..Its the Norcold class action settlement a couple years ago of about a grand in total ( 4 annual checks) for the 1200 series refrigerators , less for other models , if they were within a certain manufacture date.verified by serial numbers .. No matter now ,as its too late to get in for those that didn't file.