I have never found one. I once spent hours hunting curse eyes - killed thousands of them! It is just a very very very very rare drop.
800 kills is nothing for a deed to the land. The droprate is abysmal, yes, but that's intended. This isn't bugged.
I remember I once hunted Curse Eyes in these maps in Sleepwood for like 2 days when I was sick and was just grinding that one map the whole day for hours straight. I killed several 1000s of Curse Eyes (had like several 1000s of Curse Eye tails to npc even) before the first deed dropped - and right when I wanted to leave the map for good the second day it dropped again amongst the last few Curse Eyes lol. Rngeesus drunk piece of Silk.
can confirm that they do drop it, i killed roughly 2k of them without getting one, then almost 2 years later i just grinded jr. boogies cards in a map that is shared with curse eyes and it just... dropped
Some people have luck gaching. Some people have luck with scrolling. Some people have luck with drops at bosses. Some people have luck with Chair Gacha. Me? I dont have any of that. My luck? Blackbulls deed to the land drops