Here is a never-reprinted Peanuts strip we somehow left out of The Complete Peanuts!
That Schulz, what a genius!
(The invocation of capitalized “Happiness” in a 1959 ad, well before “Happiness is a warm puppy” was said in the strip and thus linked Peanuts to the happiness theme, may seem surprising, but the line used, “Happiness should be shared”, is actually a quote from a 1956 strip.)
The use of drawn images of Peanuts merch in telling the story does remind me of The Colorful Story of Avon Toys, a 1970s giveaway meant to promote licensed shampoo bottles and the like.