By the way , My wife photos arrived to the processing center safely and I have the PR now.Two months back I have asked CIC about the same issue and they have instructed me as the following
"
If you would like to have proof that your photos were received, you may use registered or express mail with Canada Post or a courier service such as Purolator, UPS, FedEx, etc. Please instruct the courier service to use this address:
Case Processing Centre - PRC
49 Dorchester Street
Sydney, NS
B1P 5Z2
"