I have never heard of anything even close to this before. My vote is myth/rumor/joke.
Maybe I am missing something?
As "rumor" goes, somewhere in the treasure room scene on PotC, Tink suppsoedly resides there. There are other appearances of other characters (Beast, Pooh, Goofy, etc) throughout the ride - the majority of them being included as shadows and silhouettes (e.g. The lady who is concerned about her dear Carlos drowning, when the windows are shut, her silhouette purportedly resembles a silhouette of Pooh).
"Disneyland is a work of love. We didn't go into Disneyland just with the idea of making money" - Walt Disney