At the 2006 Festival, Jim Pierson was auctioning off a box of documents from the Curtis archives. This one was a box of script pages, the ones dealing with scene summaries and cast lists. They have handwritten notes with things like Betsy Durkin's telephone number, the voice over used to announce that "the part of Carolyn Stoddard will be played by Miss Diana Walker", notes on "pre-tape sequences", doodles of faces on the pages, the name Molly is crossed out and replaced with Amy. Many have nothing written on them. Most bear the name COSTELLO. I theorize that these were pages from his scripts and were either identified as such by him, or by some unkown office person. It just occurred to me to compare the other writing with the signature. DUH!! That should be helpful!