If Helen Keller's products in the physical store can't find the arrival number online, it may be because the products are old, limited edition or customized edition, so there is no record in the online database. In addition, the article numbers of some brands may only be recorded in official website, and it is difficult to find them elsewhere.
If you want to confirm the product number of Helen Keller, I suggest you contact Helen Keller's official customer service or physical store staff directly for consultation. They may be able to provide more accurate information and help.