Via BoingBoing, why is the Indiana Election Commission putting cubes of styrofoam in their mailers?

The Styrofoam cube enclosed in this envelope is being included by the sender to meet a United States Postal Service regulation. This regulation requires a first class letter or flat using the Delivery or Signature Confirmation service to become a parcel and that it “is in a box or, if not in a box, is more than 3/4 of an inch thick at its thickest point.” The cube has no other purpose and may be disposed of upon opening this correspondence.

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