With an old shirt as their only clue, the Andheri (E) police solved a robbery case, involving a laundry boy who targeted an elderly couple, in seven hours flat. Ramkrishna Swaminathan (71), the victim, is a retired LIC official and stays with his wife at Om Nagar in Andheri. At 11.15 am on March 18, Sanjeev Chaudhary, knocked at their door.