, I find it unlikely that any of the Quendi endured for that long, as according to even the most liberal reading of Tolkien's writings on the subject, they would have wasted away long before then. It implies that they (presumably Avari/Silvan elves) would've become something more akin to spirits, if that. If anything of them would survive into modern times, it would most likely be creatures not unlike the various Fae (fairies, elves, gnomes, trolls, etc.) of west European mythology. Or perhaps nature/tree spirits as exists in Pagan and Animist belief systems.
In other words, misty, spectral creatures seldom encountered by people deemed in complete command of their senses. Kind of like the Barrow Wights of their own time.