Well not exactly a secret compartment, but a black hole like under your sofa cushions. Move the passenger seat all the way forward,
tilt it forward and feel around under the seat mounting rails in front of the back anchor bolt. There is a gap there that has eaten every small item that I've lost or dropped in the car. Good hunting!
JohnA

 

now every idiot is going to run to the car and check

 

Man ... that's a great place to hide my ____________ .

Choose your own adventure!

 

So that's where my pet hamster got to!!!!!

Ooops!