Originally Posted by RedBullet
It boots into stock just fine. When it boots the first splash screen says SAMSUNG Custom and shows an unlock symbol.
Aight, everything for obtaining root has been laid out already. The presence of the lock symbol on boot only symbolizes that there was some modification that wasn't reset before the phone was last restored to stock. It's nothing more than that, although it is harmless. It is not an indication of an unlocked bootloader. If it was, you would not receive that error with Odin when flashing a custom recovery (assuming it was meant for Verizon S3 of course). With Safestrap installed, only TouchWiz 4.3 VRUCML1 roms can be flashed. This means no AOSP, at all.
If you just want to see about getting a working stock recovery again, try Odin flashing the VRUCML1 tar. This will wipe the phone again and should restore the stock recovery. It may also get rid of the lock symbol but that's probably beyond the scope of what can be done once on the official 4.3 OTAs.
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[VZW] Samsung Galaxy SIII