Actually, my Whitebox arrived last week, but i'm busy enjoying its old-school goodness at the moment. It contains the character booklet, Matt Finch's Quick Primer, some graph paper, a book of spells, a treasure booklet, and as a bonus, an adventure entitled The Vile Worm of the Eldritch Oak. The box is very nicely done, with art on the sides and top, and the text and illustrations in the booklets are clear and crisp.
Each booklet is approximately 24 pages, so this is truly a rules-light game, upon which you can add your own house-rules. The adventure is approximately 16 pages, more of a mini-adventure, but I think it is perfect for a new DM, with just the right number of illustrations and background. It should take you at most two sessions to finish this adventure.
It's great to have this game in booklet form, and with the spell book separate from the character booklet. I much prefer the individual books for players, separate from the world building books, as it contributes to the sense of mystery, by players not having access to the bestiary and treasure lists.
I've thrown a copy of Philitomy's Musings and Chgowiz's S&W Reference Sheets into my box as well. Philotomy's musings is a valuable resource for the DM, as are the reference sheets.
I have ordered a second boxed set, along with some extra character booklets. I can hardly wait until those arrive, so I can give each of the players their own character reference booklet.