I don't think that, regardless of the veracity of the age of this relic, this is a big deal theologically. Archaeologists and historians might find it cool, but those who already believe don't need more proof and those who don't aren't likely to be swayed by a 2000-y/o set of etchings.
(If you think the Bible's more than just a fairy tale of the Spaghetti Monster)
The Hebrews, for example, had just been led by the providence of God out of slavery (through a wall of water)...they saw God's presence right in front of them every day as a pillar of smoke by day and a pillar of fire by night...they had food dropped onto their doorstep in the middle of a desert every day (except the Sabbath) for 40 years, and saw water drawn from rocks when they got thirsty...they saw the walls of a fortress come down just by walking around them and blowing their trumpets...
And yet there were still those who doubted that God was Who He said He was, and worshipped the gods of the people of Canaan or the magicians of Moab or those of the Philistines instead of the One who was visible to them for 40 years.
In Jesus' day, he healed blind people by spitting on dirt and rubbing the mud in their eyes...He made people paralyzed from birth walk again and brought dead people back to life. Not only were these visible signs not enough proof to the skeptics that he was who he said he was, but they used the proof of their existence to attempt to bring charges against him for doing them on holy days.
John 20:24-29 (The story of "Doubting" Thomas) applies, as well.
This is kind of cool, but not much in the way of theological relevance here.