Somebody has a 1957 Western Round-Up test wrapper listed on eBay right now which I haven't seen previously. The description includes the following text:
"Very rare find. This paper wrapper was used and covered a pack sold in candy stores in 1957. A test issue that was very limited to start, and I wouldn't think there's more than a handful in existence now. The wrapper would be high grade but for a tear that extends from the middle left border to the fold line. The tape you see has nothing to do with the tear and was issued this way to close the pack. Therefore, on the corresponding side right border also has a tiny spot of paper loss. All of these paper issue packs have this because they were issued with the tape. Other than that tear, it's in nice shape."