Dude, anyone can claim they were the person on 4chan who did that. Anyone.
You're a bit confused on what 4chan is.
Everyone posts as Anonymous on 4chan.
Once a thread gets 15 pages long it is deleted.
If no one replies to a thread after a couple of hours it gets deleted.
There are no archives in 4chan.
4chan claiming that they did they did the piss thing last month and here is the thread to prove it is a 4chan joke.
The hacker group Anonymous started at 4chan. Because... wait for it... everyone is called Anonymous there.
Back in this thread I asked you what your moniker was on 4chan. Remember that?
Please, you gotta stop, you're killing me.