I have the Canadian Tire aluminum tool case also. Like it (at the sale price especially).
I got the sticker off by
1. trying to peel off what I could (and getting frustrated)
2. scraping a little with a plastic putty knife (more frustration but no damage to the finish)
3. randomly scoring the remaining sticker with the plastic putty knife
4. rubbing the sticker with vegetable oil (I think it was grapeseed, could have been some old olive oil, doesn't matter what) and leaving it for a day
5. sticker was easily scraped off with the plastic putty knife. Cleaned up any remnants with kerosene and then rubbing alcohol.
I have to admit it was one of the tougher stickers I have ever dealt with. Easily the biggest downside to the CT box.
Windex doesn't usually work for me for this sort of thing, so I didn't try it. Based on the reviews on the CT site, some people have stickers that just peel off, while others can't seem to get them off without major surgery. Maybe the Chinese factory isn't consistent with the sticker or glue...