unrecordedadjective
/ˌʌn.rɪˈkɔː.dɪd//-ˈkɔːr-/not written about before, and therefore not known about:
Patterson discovered the previously unrecorded animal in 1999.
(of sounds or moving pictures) not recorded on electronic equipment:
The singer told fans he had a new unrecorded song to try out on them.