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My favorite way to hide something like a phylactery is to wrap it in gold, have some random goblin swallow it, throw an "Amulet of Proof against Detection and Location" around its neck, then cast "Imprisonment" on the goblin in some difficult to get to location.* That keeps everything on the same plane, but doesn't fit with your desire to hide it in a more mundane, scry-proof location. It's technically findable, but good luck. If your lich has access to mythic magic, you can use a mythic modify memory to have the goblin's name forgotten by everyone, just to be sure.
*This method is more useful for the old 3.0 "Hide Life" spell than a phylactery, but I ruled that a rejuvenated lich would appear at the point where the imprisonment was cast instead of at the undefined point "deep in the earth" where the goblin is cached. That doesn't seem to be a real location, else there would be a chance that someone down below would find the victim of the spell.