Where was the parcel sent by you? Given sentence is in simple past tense and it is in active voice Rule : Where + (was/were) + Subject + V3 + Other agents + ?
From Voice · English Language Competence Test
They have spotted me in the crowd.
People in Egypt speak Arabic.
My mother mustn't be disturbed.
People say that he is a spy.
Who did you laugh at?
Do you imitate others?
Little strokes fell great oaks.
The MD told us about the new project.