Maybe this method can be used temporarily.
For this example, I'll quote
Theymos's post to
this topic.
Step1 - I seek the sources that I'll quote in the history of Theymos's post.Step2 to 3 - Then I copy the quote link in a new tab and change the source topic link that I marked above
with the number of the OP link (in this topic).
Step4 - Then click enter
And I managed to quote Theymos locked posts cheers
I hope this helps to claim ownership of someone's account in the future.
If you get a message similar to "your account is locked"
You should be given an email address in the error message. Send an email there and you will be given further instructions.
~snip~
Edit...
Maybe, the post label also need to be changed
Sorry for my bad English, I hope these pictures help you understand what I mean .