Yeah, the vaccume packed ones will be just fine. They should have a date on them, but if they have been frozen, they would be ok in the seal for at least 2 weeks. Of course ribs never last that long around my house.
And because I'm a rib snob...
http://www.tfproject.org/tfp/showthread.php?t=90638 Looks like some of the pictures have gotten nuked, but you get the idea.