документы о принадлежности данного товара Продавцу.

Выражение встречается в следующем контексте: деловое письмо.

Заранее спасибо.

Instrument or document evidencing ownership of goods

Or: certificate of title/ document of title
Certificates of Title are documents that may be used to establish the current owner of a piece of property. Along with identifying the current owner, a Certificate of Title will also provide other valuable information about the status of the property, including any existing easements or encumbrances on the land and buildings located on the property. Full disclosure of the status of the property on the Certificate of Title can help lenders and potential buyers to be fully apprised of the current situation of the asset, and thus make a decision about whether to move forward with the proposed transaction.
http://www.wisegeek.com/what-is-a-certificate-of-title.htm