''We have realised that vaccination certificates were not given to the victims on the same day that they were administered the fake vaccines. Later, certificates were issued using the names of three different hospitals. That is how people realised something was wrong,'' Sakhre said. ''These hospitals, however, said they had not provided the vials used in these camps. We have also written to the Serum Institute of India,'' he said. The high court has directed the BMC and the state government to file their affidavits responding to the court's queries and directions by June 29, the next date of hearing.