I would be interested in a 'hidden' storage
I'm new to the forum, and given the date of this post it may be too old but I would also be interested if something was ever made.I found a loadspace security storage box on landrover accessory website, but I believe this attaches in the trunk "loadspace luggage rails", which is where my dog resides. (I cannot attach link due to being a new member).
I work with engineers, and showed one of them the removable cup holder with *hidden* storage today. If I cannot find a solution I may have him customize that to be lockable, which he believes could be done, but may not look as pretty if it's not custom made. If I can garner enough interest, I could have them 3D print lockable cup-holders and setup a Kickstarter to bring down the cost for everyone, would require ~30 people. Putting it out there for now...