I got my little Smart "used" with 2000 miles. I took it the next day to Mercedes, who did the 2.0 upgrade, inspected the VIN plate, and gave me a new manual.
The horn wasn't (and still isn't) working, so they ordered some new computer/electronic part. This part controls the horn, the automatic door locks on the passenger side, and heaven knows what else. I just really want a horn please!!
The car also came with only one key, so I ordered a new one..... $250!!! OUCH!!