I hate to burst anyone's bubble, but you may or may not get them. About a month ago I ordered a comforter, sheets, shams, bedskirt, curtains, etc...the whole enchilada to re do my dd's room (yeah for her big girl bed...she got a full size!). Anyway, one item was NOT in the box, even though the packing slip said it was. I called Target right away & they were apologetic...but said it was essentially too bad for me, as they had no more of the item in stock & didn't know when they'd be getting them back in.
Now, they refunded my Visa & gave me a $10 credit on my target.com acct for my inconvenience, which was great. Plus, they got the item back in stock 2 days later & I snapped it up using my $10 off!
Point is, cross your fingers & hope for the best. If you don't get your seat, though, call & politely complain. You'll likely get something for your hassle, as they want to keep customers. Good luck...I'm sending positive vibes your way!!