Blobs up to 5.1.1 are saved automatically through Cydia during the signing window assuming 5.1.1 was being signed at the time. 6.0 and above have to saved manually during the signing period. If you did not save blobs manually for iOS 6.0+, you cannot restore to those iOS. If blobs were not saved through Cydia, you do not have blobs to use. Assuming your phone is still currently jailbroken, open up Cydia, and look at the top of the main page and see what iOS are listed. If you do not see iOS listed and it says "See TSS", then on the main page, look for the "TSS Center" bubble and see which blobs are listed