Once lost an electric razor. Found it 3 months later in the small drawer in the dash.
When I smoked, if my lighter was running out, I could guarantee finding at least half a dozen behind the seats of the first 3 motors that had been parked up and left unlocked.
Some nice pens too. A few pound coins.
I now carry spare lighters after discovering a leaky bottle of ■■■■. Was heaving for about 2 hours