Cookie Monster & Ernie were released in Sept. 2007.
Elmo was released in the first week of Jan. 2008.
All 3 have dates of 2007 on the boxes and of 2006 on their tush tags.
Cookie Monster was released in a slightly different box with a model # of M2685. with a Elmo Keychain Model #L6952.
The different model number is for the box only. The Cookie Monster has the same Assortment # and Model # shown here.
Model # L6567
Model # L6568
Model # L8931