Wacky Packages Return Sketch Cards Old School Series 6 (OS6/OLDS6)
As far as we can tell there are 44 sketch card artists for this series. The artists work for very cheap their primary reward is that they are given a small number of so-called "return" cards that they can sell. A return card is a blank OS6 sketch card that they can do custom. They typically sell these for between $50 and $150. Artist were given between one and four return cards for this series, depending on how many sketch cards they produced.