The Louis Vuitton Neverfull was first introduced in 2007 to instance success. It comes in several sizes and designs and is one of the most popular bags in resale today. However, since Louis Vuitton only started selling Neverfulls with matching detachable pouches in 2014, most Neverfull bags available on StockX won't have a matching pouch.
Even bags that are from 2014 and newer sometimes don't have the matching pouch. If a bag does come with a pouch on StockX, it will be visible in the image on the listing.
If you're interested in owning a Neverfull with a pouch, please check the image on the listing very carefully to ensure the pouch is included.