You can apparently order a new one sent to your address without sending the old one back for far less money. Do that instead.
They don't do that anymore either. According to them without mailing it back your pretty much screwed now. Definitely do not want to lose your yubikey or your in big troubles.
Hello,
You may still order a new Yubikey from
https://yubikey.mtgox.com/ which will replace the old Yubikey linked to your account.
Not according to tech support. They say a lot of things but don't do anything...Originally they asked me to provide account history to prove it was my account so they could unlink it. After doing that they decided that I had to mail it in. This after they already assured me if my yubikey was lost it was not a problem. If they don't like you though they will just close your ticket, lock out your account and keep your money. Last thing they told me was to find and mail in my yubikey or they won't help me.. Even if I had a yubikey I would not mail it to these guys. They would probably just pretend it never got there, or my luck it would get lost in the mail. They said that if someone lost there yubikey, they will unlink it from the account, but if your yubikey breaks they won't unlink it from your account until you pay to mail it. Cross your fingers that it does not get lost. What kind of nonsense is that..So they said point blank if you break your yubikey and then lose it your never getting access to your account...What a clown outfit, they would use any excuse to lock people from their accounts.
It IS support that is responding to you. Getting hysterical about imagined dire scenarios is just silly. Insure the hell out of it, send it International Priority, which will cost you about $30 US, and get your new key that they have graciously offered to send at no cost. Why would they throw away their entire reputation to steal a few thousand dollars from you? They make that much in fees in a couple of hours, they don't need to kill that golden goose.
And really, stop the FUD. It is over the top, doesn't make your point any better to have multiple threads about it, and just paints you in a poor light when you are clearly being offered pretty damn good customer service right here in the open. Unless you have a reason that might make them right in this, do what they are suggested and send them the key back.