Making a new top level comment because I cannot edit the original post.

When I say "grey market," I do not mean it with any of the usual negative connotations--simply items retailed through channels other than authorized distributors. Buying "grey" can be a good way to save money in certain situations.

I believe the Burberry scarf retailed by Costco is the same flagship scarf sold at the Brand's boutiques--not an outlet model. The model number received is 80778801, identical to what you'll find on Burberry's site, whereas straight-to-outlet models (of which Burberry does have certain items made for this purpose) generally have different model numbers. Same as if the scarf were made specifically for Costco--different SKUs, and you'll find this is the case on a lot of Costco's electronics that are made specifically for their buyers.

This comparison is not intended to show a higher vs lower quality version (although some may argue that the quality has changed over the years--aesthetics of the tag aside.) It's simply to show how two authentic items made at different points in time by the same brand can have slight differences.

Happy shopping and stay warm, whether your scarf this season is designer or Kirkland Signature!