Well, exactly. blantonl claims that his ownership rights are based on his ability to restrict access to things which is not a mainstream view.

Your example illustrates this nicely. Walgreens owns the goods on their shelves regardless of shoplifters.

I'm glad you agree with my point that Walgreens owns their merchandise not because they stop shoplifters and restrict access, its because they purchased it and have title over it, and since GP has done no such thing they don't actually own it.