Interesting idea! If it works out, I'll have to look into it myself.
Just the other day I pulled out the rear seat bottoms to reattach the upholstery (it was beginning to come off the frame pretty badly). Lo and behold, what do I find caught in the springs but a
fork I must have lost in there in grade school (never let kids eat in the car!
).
Combine that with a marble from the same era I recently found after removing the front passenger seat completely (wedged under the bolt clips) and this is beginning to look like an archaeological dig...