Be creative nobody knows your car or your house better than you and dont write to internet or tell your friends even closest ones
Pop the cap off of the little bar on the bottom of plastic window blinds. It's hollow. Put your shit in, pop the cap back on. You're done.
In a Baggie inside a big tub of protein powder. Messy to get in and out, but concealable. Also behind bookshelves, filling cabinets etc. That being said I don't need to hide most of my stuff apart from the odd RC. Medicine safe does it for me as I'm scribed/been scribed most if not all of my stuff.
Best hiding place I had it was when I was in highschool. Inside of a pickle jar, inside of an abandoned rabbit burrow on a trail, outside of my house. No one ever looked there. Hell, no one expects you to have a hiding spot outside! These days I keep it inside of a tackle box with open water lures. Even if i decide to go fishing with family, there is no reason we need to bring lures for sharks or sailfish lol.