In my opinion it's not by the hand of Elvis Presley.
Elvis was a prolific signer etc. In addition his extra wording was often scribble. Yours is clearly written suggesting a different hand. The signature looks shaky and perhaps slowly written.
I would resubmit it to julien's and hope for the best.
Julien's are a notable auction house. They often get some fantastic items. But they also consign questionable items.