As it turns out, the commercial was never aired -- but all three monsters had a future in the Muppet cast. The "Crown-Grabber" was used in an Ed Sullivan Show sketch, in which he ruins a girl's beautiful day. Known from then on as the Beautiful Day Monster, he made a number of appearances on Sesame Street and The Muppet Show. The "Flute-Snatcher" turned into a background monster from The Great Santa Claus Switch and in The Muppets Take Manhattan wedding scene.
And then there's the "Wheel-Stealer", who was destined for greater things.
In 1967, Henson used the "Wheel-Stealer" puppet for an IBM training film called "The Coffee Break Machine". In the sketch, the monster devoured a complex coffee maker that explained its construction. His greed gets the better of him, however, as the machine's recording continues (within his stomach), announcing that the monster has activated its anti-vandalism program, which contains the most powerful explosives in the world. The monster promptly explodes. This sketch was also performed in October, 1967 on The Ed Sullivan Show, although it turns out that the machine itself is a bomb.
Two years later, a similar-looking monster named Arnold was used for three commercials selling Munchos, a Frito-Lay "potato crisp". After the three ads were produced, Henson had the opportunity to renew the contract. He chose not to, because at that point he was working on Sesame Street -- and that monster puppet was moving on to the next stage in his career.