Nerd,
I agree with you it does matter if they are passed off as the real thing.
I know that Bert did it regularly - don't know that Ewan did, though he might have at one time or another.
And then there's the story of Aunt Mollie Jackson giving Lomax Robin Hood ballads - from (I think) the Kitteridge edition of Child she had on her bookshelf. Any truth in this story?
Jim Carroll