In the US as at least, most Enterprises have now gone to a digital system with a tablet that they do the walk around on; when you sign on the tablet, you are acknowledging the vehicle condition documented at the time of rental, fuel level, and contract terms. For me, they email me a copy of the same in PDF format as that is the contract and proof I am legally able to drive.

Now, I don't know Canada law on the same, but my guess is it may be similar is some regards and signed agreeing to what was documented at the walk around not realizing that was also the existing damage information.