i'll second that motion
more incognito containing forms are required
the more boring the better
let me think for a moment, what is a good cylindrical object of zero interest...
curtain chain things often have scope of a cylindrical object stuck somewhere along the cable, this could work, just need a way to open it up
fake cable ferrite noise absorbers (make the rings of each segment with a slit on one side wide enough for a typical USB cable)
(could even make them real, steel washers with the slit cut could actually reduce noise just like a ferrite one)
can't think of any other easy cylindrical things that exist in a modern house that are low key
I just looked at the doodle on my loop-pull-curtains and they are that pill-shape type with the lenticular opening on one side that are clamped closed over two beads on either end of the thread that has plastic beads at every regular interval with a tiny space for the thread (nylon i presume)
building such a thing with 3d printer would be easy to expand it so it's a full pill-shape enough to embed a set of word-nuts in the middle of it like this, you could make it quite stylish and have one on every curtain with most of them being dummies with nonsense picked out from what was left over after you picked out your seed phrase from a 2048 piece pack to do a few of them
put the real ones in the last place you'd look even if you discovered they had these things and probably they get stuck discovering bogus nonsense and give up
or maybe better, just put nothing on the bogus ones so they don't initially expect to look for them after finding a couple with no inscriptions on them
another one, for the non-string-of-bead type curtain pullers (just noticed one of my house curtains has this other type)
they are just a pully wheel with a weight. perfect place to hide one, even easier than the beady ones