The first superbowl is in this same limbo, someone has a copy, but the NFL claims copyright (they dont have a copy however).
This script may be a one of a kind as well. They own the physical media, but the rights are still held by the creator or the estate.
This is sorta a legal quagmire, The copyright holder cant reproduce it, which is the purpose of copyright (to allow for reproduction) and the physical owner may not be allowed to even sell the media (time shifting is legal but only personal use). Mix in some questions if copyright applies since the law at the time was "strange".