The Andhra Pradesh police have solved the mystery of the dead body parcel case by arresting three people, police said on Friday. Sridhar Varma, Penmetsa Sushma, and Chekuri Revathi were arrested for hatching 'Operation Siddha-Chepa' conspiracy to threaten Sagi Tulasi and her parents, Mudunuri Ranga Raju (60) and Mudunuri Hymavathi (56), in an attempt to take over their property. On December 19, the body of a 47-year-old unidentified man was delivered to Mudunuri Ranga Raju's home in Yendagandi village in West Godavari district, in a wooden box, accompanied by a letter demanding over Rs one crore from the family.