Did a Google search on "hidden extra keys". Here is what was returned along with pointers about hiding keys around the house etc... The return below was number 16 out over 24.9 million hits. The same search string returns as number 3, yes number 3, on Yahoo.
Hidden extra keys - Thor Forums
› ... › Modifications and Updates
Feb 3, 2016 - 14 posts - 7 authors
So I made a third set of keys
and hid them in the extra
sewer hose holder I previously ... Click image for larger version Name: Hidden keys
Clicking the link in the return takes one to Darren's post with pictures.
That post is available for viewing by any Google user whether their intentions are good or bad.
Bottom line, nothing on this forum is "secret" so you are posting at your own risk.
Now, where did I put those links for the electronic locks and RV security system?