I'm not sure of the circs surrounding your situation or not being able to move back to Canada sooner, I was around 9 months short when I returned back from the UK and yes took a chance when returning, I was not reported and have since been here 3 years and successfully renewed my PR card.
Regardless of whether they physically take or do not take your PR card, the main thing you should be worried about is if the CBSA officer reports you or not, if he/she does then of course you will need to let the process run its course and I assume appeal....but again if they say nothing then come in, stay put and renew once you have physically been here over two years.
Reading your post again....I'm unsure about the 'will need it to come back next day and rejoin my job in my home country.'.....that's a little confusing