In a nutshell,Ivory has to be able to expand and contract,It also needs to be kept hydrated,thus the mineral oil,just a tiny amt,renwax is also great for Ivory.
With scales (new) once they are pinned,They will be fine,all work should be done in the same local (humidity) ASAP..
True that there are new laws on the books,some states have banned the shipping of Ivory only,Ivory is not illeagal to own anywhere in CONUS.