If you have already bought it then it is all irrelevant. Just consider what you have and make tire decisions based on that. It's pretty obvious that either the PO fed you a line or the tire dealer involved pulled some kind of fast one with the Michelin recall. Either way, I would just move on but be suspicious of the fact that some of the tires were mounted with date codes out and others with the date code in. I always ask specifically to have my tires mounted with the date codes out. Put on a work shirt and crawl under there with a flashlight. If the duals have the date codes turned toward it's twin then you may need a mirror. The importance of age relating to tire safety is common knowledge these days so when ordering tires don't feel bashful about letting the dealer know that you expect the tires to be fresh or no deal. If they seem upset, then you know they are not the dealer for you.
John & Gloria
South West, Florida
2009 Leisure Travel Serenity