If the arrest was recent
Start with the county jail
Someone just arrested in Massachusetts is usually held at the arresting police department's lockup right after arrest, then in the COUNTY House of Correction / jail run by the county sheriff pending arraignment and bail — not in a state DOC prison.
Massachusetts VINE participation is LIMITED: the state DOC participates, but county House of Correction participation has historically been inconsistent (for example, Essex County), so a person held in a county jail may NOT appear in VINE.
For a recent county arrest, the reliable step is to call that county sheriff's office / House of Correction directly to confirm custody, booking, and bail; if the person was only just arrested, call the arresting police department.
County House of Correction participation in Massachusetts VINE is inconsistent, so VINELink may not show a county-held person. Contact the county sheriff's office for the county where the arrest happened; there is no single statewide county-jail roster.