Emmy you are so lucky!!!!! that is great that you got that stuff out.
You description was great: ..."small, thin, & had lots of folds, & very rubbery & hard to pull apart ”... was just what mine looked like. I have been passing a lot of scrunched up Minnie versions of them all packed together. I had an X-ray a few months ago and I think it all showed up on the film; It was causing my small intestine to bulge out. The description you gave reassured me that what I have been seeing is in fact mucoid plaque.