Almost every Holiday Swagbucks will introduce "Collector Bills." The catch is you have to be a member of Swagbucks and SEARCH. Don't worry you still have plenty of time to earn all 5 of them. Once you collect all of the Valentine Bucks you will earn an extra 14 Bucks INSTANTLY. The photo below shows you what "Collector Bills" I have earned so far.
The Valentines Collector bills started on February 6th, 2012, and will go through February 14th, 2012. Remember you can only win the "Collector Bucks" through searching Swagbucks. ;)