When I made my first shaker box I used some little plastic flowers for the inside. When my work was done and I decided to try out my shaker box all of the flowers got stuck to the mounting tape.

Now here´s my tip for this trouble:
Take it apart, if you do it carefully you should not wreck it, and tap some chalk to the mounting tape where the flowers(or what ever you use) always get stuck to. I also found out, because I took my box apart my tape wasn´t sticking anymore, so I putted a double-sticky tape on the mounting tape, and it got perfectly well sticky again.

I hope you understood this and I hope this helps:)