Decent collection, most valuable shell in there is most likely Ophioglossolambis violacea or some or the larger shells. The two larger tiger cowries look like tigris schilderiana and they are worth a few hundred or even thousands depending on size. Unfortunately the majority of the cowries are all of very little value due to them having lots of dust on them which causes them to fade and dull. Amoria exoptanda used to be a rare shell back in the day but now only considered to be slightly uncommon
Fifth shelf up from bottom on left side are two Strombus goliath. These are getting harder to find and command many hundreds of dollars on the market. Their range is restricted to the horn of Brazil around city of Natal. The fourth shelf up has Charonia triton. Large specimens like those start at 50$. Looks like they are missing their operculums so that reduces their specimen value.
