All good advice above, just to add though, notify the Police that a minor parking bump has taken place, and stress no injuries were incurred, make clear that you believe that the accident seems suspicious, be prepared to provide you documents, because they will ask! Police will also ask the other driver to do the same, this should sort out whether he's legal or not! and as already said, dont admit to anything
Then if its a genuine claim, let the insurance company fight it out, this is what they are paid to do...
Thom