I had figured that it was either GP or CH; but haven't been able to find any definitive link between them
My opinion about the account:
Arcas, as you said, originally @Arcas, run by an American.
It can be seen from the initial post that it did the part: speculation & goods.
Proof:Asking .045BTC, which is about $25 at current prices. Shipping will be free to the continental United States.
And then switch to Indonesian, can be seen from the post history pages 14 to 52.
Proof:Indonesian local post:
https://bitcointalk.org/index.php?action=profile;u=111993;sa=showPosts;start=1020https://archive.is/wip/RuVHe
The third.
This is still being investigated, who actually manages the @Arcas account, at this time, the current post history focuses on gambling with harsh words.
Proof:Post:
https://bitcointalk.org/index.php?action=profile;u=111993;sa=showPostsThe question arises here;
1. Sold to a third party or second user.
the fact continues ....!