Spoiler:
It's hinted at that there's something odd about them throughout the books, but the obols aren't really fully explained to the PCs until Book 5, when Miraina has a chance to closely examine them with the proper equipment. Until then just leave it to the PCs' imaginations as to what exactly is "wrong" with them that the psychopomps and such are so curious about and why they are so able to resist negative energy and necromancy.
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Miraina is able to detect the obols and even figure out what they are just with Arcane Sight, which means the PC's should be able to detect the presence of the obols with Detect Magic. While the skill check DC's to give more revealing answers should be borderline impossible at the low levels, you could give the PC's retries whenever they gain access to libraries or spend time doing additional research and drip-feed info to them. Miraina in this sense acts as a backup to exposit any details the PC's didn't learn on their own.