Relics, while sealed, do not exhibit any distinct features of the Path.
Minister Griffiths clearly had not completed the unsealing, otherwise, the relic should have been able to "burst forth" from the corpse by Lily.
Therefore, it is not surprising that even after being examined thrice over by the Arbitration Hall, Supervisory Court, and Supervisory Bureau, nothing was discovered—after all, no one dares to tamper with a divine image recklessly. They probably didn't even dare to touch it.
Although the number of the Nine Pillar Gods and Celestial Marshals is limited, there is no shortage of Angel Envoys.
The Nine Pillars Divine Church allows worship of all current Nine Pillar Gods and their corresponding Angel Envoys, and does not restrict the worship of Celestial Marshals and their Angel Envoys. Only formal worship activities towards Celestial Marshals and their Angel Envoys or outright sacrifices, like those of the Dwarves, are considered illegal.