I don’t recall there having been one in the Valley of the Kings, but there are always newly discovered tombs. The work that cleared KV-40, which had previously been filled with rubble and of no apparent interest to anyone (it had been known a long while) was finally excavated, and that took some time, 50 mummies or parts of mummies were found, news came in 2014.
Fifty. Wow. Were they in graves?