Volume 4

Powell's began shipping Volume 4 in August 2008. 750 boxes were produced for Volume 4. Volume 4 included: Note: This box may have come with additional items, but the information is missing.
 * A specially bound hardcover copy of Clown Girl by Monica Drake
 * A copy of The Super Crazy Cat Dance, a comic by Aron Nels Steinke
 * A rubber chicken keychain

Source: https://www.artisthenewreligion.com/art_is_the_new_religion/2008/08/unboxing-indiespensable.html