Almost 100% of naturally found rugosum over 80mm have missing tops. Shells under 3in generally are intact. Larger specimens have "doctored" tops that can be easily detected by using a good lupe or black light scanner. Any dealer offering giant-sized Epitonids should allow customers to examine them first. Also PI dealers have been offering "faked" 100mm+ rugosum made from dental paste in casted molds. Detection is simply made by making sure you can follow the spiral whorls internally w/a wire or cord. Casted fakes have blocked last whorls. Also you can smell a pasty resin scent when you hold it close to your nose. Faked shells are near Gem quality and operculum are blacken Angaria opercs. Just remove the operc & cotton to examine the shell internally. The art of "doctoring" shells in the Philippines is getting harder to detect. Most dealers aren't aware of every shell's condition so work together & no finger pointing. CHRIS:)) c",