I worked for the vendor for Walmart during the Harry Potter Book and DVD releases. These things have been packed away.
The following were given out for the Hardback Release of Harry Potter And The Deathly Hallows on July 21, 2007:
Bookmarks - set of 100 seal is broken - measures 2 1/2" X 9 1/2"
Pensieve Challenge Trivia Cards - set of 83 - measures 3 1/2" X 8"
Wristbands - 4 blue (Ravenclaw), 3 yellow (Hufflepuff) and 1 green (Slytherin)
The following were given out for the Blu-Ray Combo Pack Release of Harry Potter And The Deathly Hallows Part 2 on November 11, 2011:
Harry Cardboard Button Pinback - has scuff on back - measures 2 5/8" x 4"
Hermione Cardboard Button Pinback - has scuff on back - measures 2 5/8" X 4"
Harry Cardboard Badge - has no pin on back - measures 2 5/8" x 4"
Hermione Cardboard Badge - has no pin on back - measures 2 5/8" X 4"
The following were given out for the DVD/BluRay Combo Release of Harry Potter And The Deathly Hallows Pt 2 on April 15, 2011:
Lanyard
The following were for the Half-Blood Prince Book Release July 16, 2005
Temporary Tattoos - set of 2 - measures 2" square
Card On Chain - measures 3" X 5"
Button Pinback - measures 2" square
The Sorcerer's Stone DVD Release May 28, 2002
Hagrid Button Pinback - has a few marks on front - measures 2 1/2" X 3 1/2"
Prisoner Of Azkaban DVD Release November 23, 2004
Harry Button pinback - measures 2 1/2" X 3 1/2"
Goblet Of Fire DVD Release March 7, 2006
Button pinback - measures 2 1/2" x 3 1/2"
Order of the Phoenix (do not know if this is for Book or DVD release - no date on it)
Wand Pen - does not write - approx 9" long
Harry Potter Glasses - plastic - small 4 1/2" X 2 1/2" - no lenses - quantity of 3
(there is no date or any other info on the glasses - I do not remember which release they were for) for decoration.
Items are in very good almost new condition except where noted.