The Copied Factory raid will eventually let you upgrade your deepshadow weapon to i470 at some point before 5.2. They always first let you trade in the 24-man coins for upgrades to your armor and accessories, then near the end of the patch they add weapon upgrade items to the list as well. They do this for every 24-man, with each successive raid needing the previous raid's coins to upgrade the weapon as well. So come 5.3 when the next leg of the Nier raid is added, you will still need Copied Factory coins as well as the new raid coin to upgrade the 5.3 tome weapon towards the end of that patch. And in 5.5 they will add the third Nier raid and towards the end of that patch you will be able to turn in all three raid coins for the final tome weapon upgrade of the expansion. So save them coins!