or I'm think the seat might have been a return to the store...the tags and everything weren't attached just in the seat...
OMG, yes. I would get on whoever sold you the seat. Seriously. Some sellers are known to resell seats that have been returned. One can argue seats that are returned shouldn't be resold period, and If they didn't even LOOK at the seat and resold it to someone who thought they were getting a brand new seat, they totally shoudl be held liable. My god, what if you had got into a collision, and the seat failed catastrophically? You need to update SKJP with the info you just told us, about the seat having no tags, etc, and SERIOUSLY need to get this seller into some serious doodoo. It's one thing to sell a seat as a disclosed return, but to send out a damaged seat to someone who bought a new seat is just beyond scum. The seller needs to be held accountable for this. I would think SKJP woudl be interested in this as well, because hey..if the seat HAD failed because of the seller's sending out a returned/crashed seat(but noone knew this), that is going to make SKJP look bad, because all anyone is going to see if that a SKJP seat failed horribly...at that point, it's be hard to prove the seat had been damaged prior, youknow? The repercussions to SKJP could be catastrophic.
Also, not to put all the blame on them..this is also a really GREAT reminder about how you really need to inspect your seats when you get them. I know a while back we had someone who found some cereal under the cover of hers, which is how she knew it had to have been an undisclosed return..

ugh. i'm just angry now.