I am not sure ,I know i thought it was kinda cool after not seeing these for a long time.So I figured I would post it an maybe everyone would think it was just as cool .thanks for stopping in :)
As an avid coin collector I can confirm that auctioning such coupons is legal, this is due to the fact they are no longer accepted.
Department of Health and Human Services newsrelease: As of "May 28, 2009 – Old Paper Food Stamp Coupons are No Good After June 17, 2009. Stores won’t accept food stamp coupons after June 17. Only EBT cards will be accepted from then on."