Love for Secondhand Britax

I LOVE this car seat. It is the Britax Boulevard. It holds children up to 65 lbs! So we now own two of them! It retails for 300 ish. Being the stay home mommy money saver that I am, I decided to "shop" around for these seats. I found Logan's in a consignment shop in Suwanee and Austin's on Craigslist. I will just say they were each under 150! More than half the price for one. Being secondhand there are questions that need to be asked. How old is the seat? Both are newer than 06, Has the seat been in a crash? Neither have, Smoker or Non-smoker? of course both from NON SMOKER, and condition? Being a clean freak, perfectionist these both had to be close to immaculate and they were!