Importing a boat into Canada

If anyone can help me answer this question it would be greatly appreciated.

My buddy is possibly selling his boat to a guy in Canada. As we were looking today, we noticed that the trailer is missing the VIN sticker. He had sandblasted the trailer and painted it a few years back and we guessed it had come off then.

So, the question I have, is this going to be an issue at the border? The guy will receive two bills of sale (one for the boat, and one for the trailer) printed up by the dealer from where he originally bought the boat. He will also have both titles for the trailer and the boat.

Any helpful insights would be much appreciated.