Hi Bag2gal -
I'm not a regular authenticator but just wanted to chime in here.
I don't see any red flags on the bag and a missing authenticity card is not a major issue as they frequently get lost or misplaced. I will tell you though that Yoogi's is a reputable seller (you can verify by performing a search on this thread, or more likely one of the previous, closed ones). Also my sister has purchased from them in the past and I recently consigned several items to them so I have some personal knowledge.
If you want further peace of mind you should consider using an authentication service for a small fee. I've used Etinceler for several bags and found them to be excellent. Here's the link if you're interested:
http://www.etincelerauthentications.com/
Hope this helps!
Cheers