Assistance with python dumper

I am making a 4chan dumper in python. It sortof works, the output says that the post was sent, but I can't find it in the specified thread. Source code: http://pastebin.com/8Yss1Tkw

you use it like so:
>./4dumper.py -b g -t 2502253

is how you use it. Any ideas on what I did wrong? (inb4 python) I found the first three functions online.

says that the post was sent, but I can't find it in the specified thread.
- Unknown paste ID, it may have expired or been deleted!
You seem to have this problem a lot.

>>1
What output, the library output or the actual HTML response?
If the HTML response is the 4chan "post successful" page or whatever it is, you must be posting to the wrong thread or board (I don't think it spoofs this response when it encounters likely bots with a blank UA, etc..)
If it is just the library is asserting it sent the post, but it doesn't show up then it is probably an issue with form submission (i.e.:  not multipart, strange encoding or something similar); check out the HTML response and post it here.