Both David and Jay have pretty much summed up the answer to your question. It is easier to tell on some of the more obscure T-206 related packs, but Sweet Caporal & Piedmont's are nearly impossible. Below are a few images on some T-206 packs. All of them, except for the Sweet Caporal (which has a high possibility as it has a 1909 tax stamp and the right district number) and the Polar Bear (I do have an authentic Polar Bear but was too lazy to scan it - these look IDENTICAL though, did contain a baseball card. The Piedmont was actually just recently opened... Enjoy!