Since the breech happened in 2013 and I've changed my password numerous times since, I doubt whether anyone got anything useful.
Also, Yahoo disabled the secret questions/answers. I use different passwords everywhere. I also never tell the truth on the secret questions so someone would really have to guess at my answers because they are not true facts anyone could find on the internet. Example of something I might use for an address 1234 Main Street, Sin City North Dakota.
Every time I've checked to see who has accessed my account, it appears to be our locale.