So I found a good deal on a car seat that is a great brand. It's one owner, no accidents, three years old (so has three years left on expiration date). I don't know this person super well but it's someone who lives by us And I trust they Aren't lying about anything but was curious if anyone else has bought a used car seat?  Any concerns I should have? Idk what to do cause I really want it and it's a good deal but I have guilt on buying something so important used.