Removing "Custom" from the boot screen for a return

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http://forum.xda-developers.com – Hello everyone, I've been looking around the forum but I haven't been able to find an answer to this. Right now I have a rooted Samsung Galaxy S4 from Verizon (I rooted it using this method: http://forum.xda-developers.com/show....php?t=2290798). The device is currently fully rooted with the original ROM in place (I have not installed ANY custom ROM's ever). I am looking to return the phone to the store tonight but when I unroot through SuperSU and then do a factory wipe (through the settings tab not through any special program) I get the "Custom" message upon booting up again. I (HowTos)