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who claimed to have seen the Ark inside during World War II...

Please pardon me, while I possibly show my ignorance... but simple question: How would one know one was looking at the Ark of the Covenant? Aren't any drawings/visuals of it purely artist renditions of it? Would one need to look inside it to verify the commandment tablets? Are the actual dimensions known? Width/depth/height? Its ornamentation?

Read the Bible: EXODUS 25:10-22

The Book of Exodus gives detailed instructions on how the Ark is to be constructed. It is to be 2½ cubits in length, 1½ in breadth, and 1½ in height (approximately 131×79×79 cm or 52×31×31 in). Then it is to be gilded entirely with gold, and a crown or molding of gold is to be put around it. Four rings of gold are to be attached to its four corners, two on each side—and through these rings staves of shittim-wood overlaid with gold for carrying the Ark are to be inserted; and these are not to be removed.

A golden lid, the kapporet (traditionally “mercy seat” in Christian translations) which is covered with 2 golden cherubim, is to be placed above the Ark. Missing from the account are instructions concerning the thickness of the mercy seat and details about the cherubim other than that the cover be beaten out the ends of the Ark and that they form the space where God will appear. The Ark is finally to be placed under the veil of the covering.

Note: the Person speaking is God, giving the instructions and specifications to Moses, who later wrote it down. "They" refers to Israelite craftsmen under Moses' direction. A cubit is about a foot and a half:

Exodus 25:10-22 New King James Version (NKJV)
The Ark of the Testimony
10 “And they shall make an ark of acacia wood; two and a half cubits shall be its length, a cubit and a half its width, and a cubit and a half its height. 11 And you shall overlay it with pure gold, inside and out you shall overlay it, and shall make on it a molding of gold all around. 12 You shall cast four rings of gold for it, and put them in its four corners; two rings shall be on one side, and two rings on the other side. 13 And you shall make poles of acacia wood, and overlay them with gold. 14 You shall put the poles into the rings on the sides of the ark, that the ark may be carried by them. 15 The poles shall be in the rings of the ark; they shall not be taken from it. 16 And you shall put into the ark the Testimony which I will give you.
17 “You shall make a mercy seat of pure gold; two and a half cubits shall be its length and a cubit and a half its width. 18 And you shall make two cherubim of gold; of hammered work you shall make them at the two ends of the mercy seat. 19 Make one cherub at one end, and the other cherub at the other end; you shall make the cherubim at the two ends of it of one piece with the mercy seat. 20 And the cherubim shall stretch out their wings above, covering the mercy seat with their wings, and they shall face one another; the faces of the cherubim shall be toward the mercy seat. 21 You shall put the mercy seat on top of the ark, and in the ark you shall put the Testimony that I will give you. 22 And there I will meet with you, and I will speak with you from above the mercy seat, from between the two cherubim which are on the ark of the Testimony, about everything which I will give you in commandment to the children of Israel.

This is an artist's conception of how such an ark would look: