They, "NBS-10*" (where * is a wildcard), are products_model.
It's the Model col. in admin->Catalog->Categories/Product
There were only 3 items shown. However, when I key in the same search term at the online storefront, 4 items were shown.
Are you referring to the search in admin or storefront? On the admin side, the search result is shown in individual rows (I'm sure you know that, I'm merely adding this for completeness sake) while on the storefront, these products are spread across 3 separate sub-categories.



) while on the storefront, these products are spread across 3 separate sub-categories.

