You can't really do anything at the moment, you can only fill in the form when you login and hope you will get your XC back.
I miss 278 XC. So no luck, as i wrote earlier, I presume they will "fail" to deliver small balances, keeping them for themselves, since people with 100-200 $ in alts can not harm them. And they can run with 1m $ or more when everything is over. Here:
https://bitcointalk.org/index.php?topic=824211.0 you can see reported amount of alt coins missing so far.