"we did not know about national skinheads; they did not exist yet"
"we did not know about national skinheads; they have not existed yet"
I know what means the first: it means that we did not know about skinheads because they did not exist but skinheads were going to exist after this time (when we did not know) and that they still exit.
Does the second sentence mean the same, the "yet" means that it will happen,does it mean that skinheads were going to exist very very shortly after this time (when we did not know)and that they still exist.
Is this sentence possible?
I know I already asked for it but not with present perfect