It sounds like you’re at the forefront of putting-prepared-eggs-in-bags research. Let us know your findings and may we take one more step closer to finally achieving the lofty dream of putting devilled eggs in a burlap sack.
Even if they do, you can’t know whether they can access the encryption keys. It’s all just layers of “but this, but that” and at the very bottom a layer of “trust me, bro”.