Even though I can't comment on your specific titles, I have noticed that an unusual amount of New Releases are simply added for Pre-Order with Limited Inventory. Once sold-out, the placeholder is simply removed from the Customer Website like it was never available.

These days, retail inventory issues are everywhere because of the Pandemic, but I had noticed the Best Buy trend prior to March.

My guess? Just like the "Planograms" they use for product placement, I'm fairly certain the same principle is used to determine stock quantities for Canada. If by chance the stock is depleted from pre-orders, then it's gone for good.
In short, not seeing an item listed does not guarantee it was never sold at some point, but that's just my own conclusion.