Oh Melissa, I am so glad to hear that all the babies arrived safe and sound. Wow, wonder if that is the longest whelp on record!!
I would have been worried too. CONGRATULATIONS!!!!!
With a possible missing placenta, definitely want to take her in to be checked and "cleaned out", though Rosie may have eaten it without your knowledge. Also, with 5 babies and the last one being so tiny, you might want to make sure he gets some extra or alone time on mama's teats. Sounds like he's got some catching up to do with his siblings.