Well, I was able to get the On Demand schedule for Sprout, and according to the list, they ARE showing Sesame Street episodes 6, 7, 8, 9, as well as some eps. from the late 3000's (would that be the 25th year?)
Look here:
http://comcast.m0.net/m/p/com/mic/search.asp?p=11&s=TITLE&k=&o=&c=Kids/Teens&n=&st=category
Look here:
http://comcast.m0.net/m/p/com/mic/search.asp?p=11&s=TITLE&k=&o=&c=Kids/Teens&n=&st=category