Checking with your local PO is a good place to start, as others have suggested.
Next would be to check with your neighbours to see if your parcel was sent to them by mistake.
If the above fail ask Mark at A&A to call in to CP to start a lost package claim. They will put a trace on the package to see where it ended up.
In most cases lost packages are mis-routed to the wrong sortation plant or delivery office, or simply were mis-delivered to the wrong address.
They won't know to look unless a claim is filed by the SENDER.
I've sent thousands of packages through CP and can count the number of lost packages on one hand, only once did they not eventually find the missing parcel, and it was covered through insurance.
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