After verifying documents of the 1,600 conservancy workers who had moved court seeking to be made permanent civic employees, the Brihanmumbai Municipal Corporation has found less than 200 of them to have valid papers. The BMC has now asked the Bombay High Court for a three-month extension to the deadline for absorbing the workers. On April 7 this year, the Supreme Court, ruling in favour of the conservancy workers, had directed the BMC to extend benefits accorded to permanent staff to those who had completed 240 days of service.