Apparently the quest is still not working.
It is interesting though that this time the sequence of monsters that I killed was totally different.
I initially killed 21 then the 22nd generated the 508-31 trigger and took the first certificate at both server and client.
The next 17 of them generated the 508-31 trigger but none of them took the certificate.
After that the next 8 did nothing. No trigger or anything.
The 9th one generated the 508-31 trigger again and took a certificate from the client. Nothing at the server.
The next few also generated the trigger but i stopped at that point.
I'm pretty sure that in the past on the official server i have had two almost in a row take the certificate after about 30 that didn't.
There doesn't appear to be any kind of pattern here. it is more or less random.
The only thing i am sure of is that the certificate is always taken when a block of triggers starts but not if the previous one generated the trigger.
21 kills with no trigger
18 kills with triggers
first one takes the certificate
8 kills no trigger
15 kills with triggers
first one takes certificate
14 kills with no trigger and so on.........
You should probably test this quest for yourself. it might make it easier
You need to be level 50+ then talk to mildun about carts
After talking to some other people, go back to mildun and he will tell you to get goblin workers to bury the certificates for you.
Although he says 'Goblin workers' he is an idiot and actually means 'Goblin Coal Mine Workers'
Just spawn a few of them and kill them to see what happens.