SmartKit recently posted an article on Liebig “Puzzle Cards.” Liebig is the Liebig Extract of Meat Company, which was founded in 1840 by Baron Justus von Liebig. His “extract of meat” product was intended to provide a cheap and nutritious meat substitute for those that couldn’t afford real meat.
The company also made sets of trading cards, some of which were hidden object puzzle cards. The cards would have a question printed on them like, “Where is the X?”, and the goal was to find that object. The card on the SmartKit site asks “Where are the other smokers?” If you read the comments for that post, you can find the answer. (Note: You won’t be able to find the object in my mini-picture. It’s just there to give you an idea of what they looked like.)
If you’re interested in more hidden object puzzle cards, I found a great collection of them on a site called cardmine.