Per the CIC Website:
http://www.cic.gc.ca/english/information/times/canada/process-in.asp#sponsorshipThey are processing apps received by May 19, and it's taking approximately 38 days to process, once received. Without a receipt from any type of courier, it's really hard for you to know when they received your file. They very well may have your file, but it has not yet begun processing, or it might be in processing now.
I would call the CIC directly, give them your receipt number and inquire if it has yet been received. They may be able to tell the sponsor even [I don't know who is sponsoring whom, as you didn't say] BUT they may be able to tell the sponsor as well the status, and if it has been approved.
I personally received informationon the telephone well before anything updated or showed on my E-cas. I sent my file in on March 23, it was received March 24, and we were approved on April 8th. [I don't think it usually takes 38 days, but there may be some backlog on their end, depending upon how many apps they have received.] Give them a call, and hopefully they can assist you.
Outside of Canada, the number to call CIC is: 001-613-944-4000
Inside of Canada, the number to call CIC is: 1-888-242-2100
Good Luck :-)