When purchasing a property at auction with symbolic possession, the mortgagee bank is responsible for facilitating your actual physical possession. This typically involves paying the full sale consideration and obtaining a registered sale certificate from the Sub-Registrar's Office (SRO). Once you have the registered sale certificate, you are the legal title holder. If the previous owner or tenant remains in possession, their occupancy is now considered illegal. You can involve the police to remove them, as the civil dispute has been settled by the court's order and sale certificate.