There are literally hundreds of manufacturers, large and small, supplying reproduction items. Like any other business or industry, there is often a wide range of quality and in this case, authenticity. But, let the buyer beware. Just because a sutler sells it doesn't mean it is authentic. Recent studies have shown just the opposite to be true.
Authenticity can be a confusing term.
For our purposes, let it mean an accurately made reproduction, correct in every detail, made from appropriate materials and from patterns taken from original items from the period of the Civil War. As stated above, many suppliers sell reproduction items that are not authentic in any way. With the wealth of original items which survive in museums and private collections, as well as photographic evidence, it is amazing how many poor quality reproductions are sold and, unfortunately, in use by thousands of reenactors. In truth, this is simply an attempt to sell their wares. The suppliers listed in your recruiting packet are accepted by discerning reenactors as those producing the highest quality reproduction items available today.