K.C.
As with Amber S...unless you know & trust who you bought them from don't use them. Even the manufacturer will (should) tell you that even if a carseat has been in a small fender bender (low impact car accident) it can have cracks that you can see in the foam & plastic.
Again, unless you know & trust the people you bought the seats from, your children are safer if you buy new seats.
You can also check the Eddie Bauer website for more info. The date they were made should be stamped into the plastic or there should be a sticker that says the manufacture date.
God bless!