Similar scam attempted on a neighbour. The phoney cop's introduction was that he was working on the neighbour's apparent involvement in drug smuggling and money-laundering. It got as far as obtaining details of the neighbour's multiple bank accounts + a lot of personal data.
However, in full panic mode, the neighbour came to see my missus who explained the scam in words of one syllable and helped the neighbour to freeze her bank accounts and notify the local cops.