Were you able to track if CIC office did receive your passport? If so, you have nothing to worry. My sister in the Philippines sent her passport in Hong Kong but we won't be able to receive any confirmation from them should they receive it. Be confident enough; it was received for Visa Stamping
Oh, you didn't make any instruction or option telling them how you prefer to receive it back? Remember, you got 3 options I belieive: 1) in person, 2) by authorizing a representative, & 3) by including self-addressed postpaid envelope. Wait for your notice once it's ready for pick up and if you can't travel, you may want to authorize somebody you can trust to pick it up for you. Remember, SOMEBODY YOU CAN TRUST!