Not sure I’ve ever heard of an embossed triangle can in the way you describe it, but I’d steer clear of a repainted one. The triangle cans you’ve found on the internet are from the Czech Republic. Mobiloil made one that I know of while Shell has quite a few (possibly more than ten). Sadly, according to a Czech friend of mine, they are now being faked, as well. Without a picture, though, I can’t say one way or another what you are taking about.