доселе неизвестный(The intriguing statue may lead to further insights as experts enlisted to look at the puzzling piece discovered that it actually sat within "a hitherto unknown, but extensive archaeological site."coasttocoastam.comART Vancouver)
до этого никому неизвестный(But they were stymied, as they had been before on several occasions, by the sudden appearance of a hitherto-unknown claimant – in this case the Ukrainian woman. 4uzhoj)
