Elsa Oliver, 28, and her boyfriend, Alberto Sierra, Jr., 23, were arrested in December on assault and child endangerment charges related to the then-disappearance of her son. He was reported missing in December, but investigators believe he'd been missing since September.
His body was discovered Friday in a suitcase along the side of Route 190.
"We're waiting for him to be released from the medical examiner's office," funeral director Walter C. Taylor of Smith-Mallahy-Masciarelli Funeral Home in Fitchburg, Mass., said Wednesday. "Injunctions filed by the mother and boyfriend's lawyer held it up. They want a private autopsy done."
The examination of the body is expected to take place no later than Monday.