Another term for letterboxing, usually used as a term for local programs such as Valley Quest in the Connecticut River Valley in Vermont and New Hampshire who sell booklets with maps and clues for their quests. (Maybe not anymore... their website no longer has this information.)

Sometimes, for letterboxers who enjoy dabbling with postals or LTCs, they’ll find a small, unexpected stamped image (usually hidden under the address label of the envelope they received). These small surprises are called a quisp. The name derives from the cereal Quisp, when Blue Box Girl mailed a Quisp shrinky dink under the address label as part of a Quisp cereal postal. Mystic Dreamer first started calling it a quisp, and the name stuck.