Maybe an answer might be in an extra-biblical book, my commentary says the story is quoted out of the "Assumption of Moses'. It must not be important enough for us to worry about. The hidden things belong to God. Jude also quotes out of the book of 1 Enoch. It looks like he was quoting these non-canonical books to support a point. So in my mind, at least what is quoted is true.
The thing is he was buried in a secret location. So, put 2+2 together, I would say Satan wanted it for nefarious purposes, like usual. He could of thought he was entitled to know the location? Maybe he held the keys of death and Hades before the cross? It's all speculation really. We know Jesus is slowly taking back the earth from Satan. (Luke 4:5-7) One day it will be completed.
17When I saw Him, I fell at His feet like a dead man. And He placed His right hand on me, saying, “Do not be afraid; I am the first and the last,
18and the living One; and I was dead, and behold, I am alive forevermore, a
nd I have the keys of death and of Hades.
The point Jude makes, is unlike false teachers, Michael did not disrespect Satan, or curse him, but rebuked him by the Lord. The whole book is a warning against false teachers and ungodly souls in the congregation, and how to know them by what they say and do.
1Now Moses went up from the plains of Moab to Mount Nebo, to the top of Pisgah, which is opposite Jericho. And the LORD showed him all the land, Gilead as far as Dan,
2and all Naphtali and the land of Ephraim and Manasseh, and all the land of Judah as far as the western sea,
3and the Negev and the plain in the valley of Jericho, the city of palm trees, as far as Zoar.
4Then the LORD said to him, “This is the land which I swore to Abraham, Isaac, and Jacob, saying, ‘I will give it to your descendants’; I have let you see
it with your eyes, but you shall not go over there.”
5So Moses the servant of the LORD died there in the land of Moab, according to the word of the LORD.
6And He buried him in the valley in the land of Moab, opposite Beth-peor;
but no man knows his burial place to this day. 7Although Moses was one hundred and twenty years old when he died, his eye was not dim, nor his vigor abated.
8So the sons of Israel wept for Moses in the plains of Moab thirty days; then the days of weeping
and mourning for Moses came to an end.