What is "Sefer ha'Miknah"?
Rashi: It is the document of sale.
Rashi citing Bava Basra 160b: This hints to a standard document. (Refer to 32:11:2:2 and the note there.)
Malbim: They used to write two documents. Sefer ha'Miknah gave the names of the buyer, seller, the sold field, the date. It was sealed for safekeeping.
What is the meaning of "Es ha'Chasum"?
Rashi: It is with the signatures, when it is signed properly.
Rashi citing Bava Basra 160b: This hints to a Get Mekushar (a tied document, in which at least three witnesses sign on the back, opposite the text 1 ).
Radak: It is Sefer ha'Miknah that was sealed. There were two other documents (like verse 14 says. Refer to 32:11:2:2, 32:11:4:3.)
Malbim: Together with Sefer ha'Miknah (refer to 31:11:1:3), they wrapped and sealed ha'Mitzvah veha'Chukim (refer to 31:11:3:3).
160b: There was a region of impetuous Kohanim. They were hasty to divorce (and could not remarry their wives). Chachamim enacted tied Gitin. They take longer to write; perhaps before it is finished, the husband will calm down and retract. There are tied monetary documents, lest there be differences between Gitin of divorce and money.
What is "ha'Mitzvah veha'Chukim"?
Bava Basra 160b: They are the differences between standard and tied Gitin.
Radak: It is Sefer ha'Mitzvah veha'Chukim. The word "Sefer" before "ha'Miknah" applies also to ha'Mitzvah veha'Chukim. It has the conditions of the sale, e.g. "Mispar Shnei Sevu'os" (Vayikra 25:15), which is a Mitzvah of the Torah, and Chukim and customs of sales that applied at the time.
Malbim: Ha'Mitzvah are conditions that are Mitzvos of the Torah, e.g. giving the money, returning in Yovel to the heirs, "Mispar Shnei Sevu'os Hu Mocher Lach" (Vayikra 25:15)
What is the meaning of "v'Es ha'Galuy"?
Rashi: It was established in Beis Din via its witnesses. The judges wrote and signed a Kiyum (affirmation) so the matter will be known and famous, lest the witnesses die.
Rashi citing Bava Basra 160b: It is the text of a tied Get. (Refer to 32:11:2:2.)
Radak, Malbim: This is a second Sefer ha'Miknah that was exposed, so they can read it without opening the sealed Sefer ha'Miknah. Malbim - the buyer kept this.
Radak citing his father: It is a document saying that he opened the ear (aroused) redeemers (relatives) if they want to buy, like Bo'az [asked Ploni Almoni if he wants to redeem - Rus 4:4].
