Moses was not buried because unlike Abraham, who was a patriarch, he was a prophet and major leader in the dispensations of God. As leader and dispenser of the Law he would've been given too much attention. Some would've worshiped him.
So he basically disappears from history, just as Enoch and Elijah did, both prophetic figures, as well. They were only the voice of God, and not God Himself. They didn't need a landmark to mark them as "God's voice."
I don't want to derail this thread, but I have to give this at this time.
Gen 5:24 And Enoch walked with God: and he was not; for God took him.
Hebrews 11:5 By faith Enoch was translated that he should not see death; and was not found, because God had translated him: for before his translation he had this testimony, that he pleased God.
Does not say Enoch was taken up to heaven, but that he was only translated that he should not see death at that particular time being he was 365 years old. Should not see death means since Enoch walked with God he would not see the second death, Rev 20:6, but only that of the first death, Hebrews 9:27, as all his days were three hundred and sixty as he died, but no one knows where.
Genesis 49: 30 In the cave that is in the field of Machpelah, which is before Mamre, in the land of Canaan, which Abraham bought with the field of Ephron the Hittite for a possession of a burying place. 31There they buried Abraham and Sarah his wife; there they buried Isaac and Rebekah his wife; and there I buried Leah.
Deuteronomy 34:5 So Moses the servant of the LORD died there in the land of Moab, according to the word of the LORD. 6 and he buried him in a valley in the land of Moab, over against Beth-peor: but no man knoweth of his sepulcher unto this day.
2 Kings 2:11 And it came to pass, as they still went on, and talked, that, behold, there appeared a chariot of fire, and horses of fire, and parted them both asunder; and Elijah went up by a whirlwind into heaven. (Heaven here means atmosphere, first heaven)
Elijah, having ascended into the air by a whirlwind was carried away out of sight beyond the horizon. Several years after he was taken away King Jehoram received a letter from him. How long after? There are some difficulties in figuring the exact chronology as it varies from 2 to 10 years or more. A note in Josephus (a Jewish historian of the first century A.D.) says 4 years, while the JEWISH ENCYCLOPEDIA figures it at 7 years.
Regardless of the exact number of years there came writing to Jehoram from Elijah the prophet, saying..." (2Chron 21:12). Now the wickedness of Jehoram, for which he was being rebuked in the letter, took place after Elijah was taken away, yet the letter speaks of these things as past events, and the punishment to come upon him as yet future. So the idea of some, that Elijah wrote the letter before he was removed by the whirlwind, is proved wrong.
Elijah was taken up by the whirlwind into the first heaven and transported to another location on Earth. God did not see fit in His purpose to reveal his whereabouts. Chariot of fire is used at times figuratively for host (angels) like in 2 Kings 2:11, 12: 6:17; Psalms 68:17; 104:1-4. Elijah, by his prayers and his counsel was the "chariot of Israel and the horseman thereof", meaning Elijah was the stronghold of Israel, the driving force of God. The Israelites never used chariots till the time of David.
There is more to this, but it needs to be another thread.