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If it was jailbroken, then the blobs are on the cydia server. Run firmware umbrella, check the box to get the shsh from cydia.

Is cydia automatically saving blobs for you whether you ask them to or not? I was under the impression that this was something that had to be manually done.
 
^^^Yeah I would like to know this too...

My IP4 is JB'd right now on 5.1.1 but not currently unlocked, looking to have AT&T do it.
Once everything is done I wish to sale the phone as a JB/Unlocked phone but I don't want to lose either as a result of cleaning all of my stuff out of it....
 
Still not clear on why you can't call AT&T and get it factory unlocked? Is the phone out of contract? Is it on AT&T or on Verizon? Some answers to those questions would make a big difference.
 
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