“When Moses had finished writing down in a book the words of this law to the very end, Moses commanded the Levites who carried the Ark of the Covenant of Yahweh, ‘Take this book of the law. Put it beside the Ark of the Covenant of Yahweh your God. Let it remain there as a witness against you. For I know how rebellious and stubborn you are. If you already have been so rebellious toward Yahweh while I am still alive among you, how much more after my death!’”
When Moses finished writing the book of the law, he wanted it placed beside the Ark of the Covenant that contained the 2 tablets with the 10 Commandments. These Mosaic observances are on put on a par with the 10 Commandments from Mt. Sinai which are already in Ark of the Covenant. Once again, it is not clear if this is the whole Torah or just this book of Deuteronomy, but it is clearly more than the 10 Commandments. Moses warned if they were rebellious now how much more would it be after his death.