The Mishnah spoke about using a document to marry. This is only relevant to a document that is not worth a Perutah, but if it was a Perutah or more, it is considered to be like marrying with money.

Beraisa (R. Chiya): Not only is it valid to use a marriage document that is worth a Perutah, as he can acquire her even with another item worth a Perutah. In fact, even if he wrote her the document on pottery or paper (that are not worth a Perutah) and gave it to her, she is married.