https://gwern.net/dnm-arrest#silk-road-1-sr1 covers a lot of places but doesn't appear to include Bulgaria in 2011-2013, so it might be missing a handful of places or it might be the tip of the iceberg.
Discussion
well now you know of one case, i may have been bulgaria's only case
also, i helped a friend at some point later run an account on alphabay and he had, i think it was 8 bitcoin stashed in his alphabay wallet
i tried to help him get his coins out where he was in control but he was too nervous about doing this... shit happens
i had no idea about alphabay at the time, but then what happened was one of its admins got arrested in Bangkok and committed suicide in custody, and that was that for my mate's - what was equal to about $5000 at the time, earnings from his dealings (he had a hookup with a local pharmacist for benzos and opiates)