Were Shepard made whole, given her full gamut of ability, she'd be easy to tell from the others, even for a typical blind person. There's a smell, that comes with the regular use of biotics; a clean, stinging-chemical smell— ozone, she's heard it called, and other poetic terms. But as she is, Shepard is at the moment merely human, and though she's not a quiet walker, neither is she a large or heavy person. Then again, they're all in bare feet, and so...

"You think humans are gonna go all the way to space and not bring their overblown holiday traditions with them?" She assumes she's either been recognized, or that he'd guessed correctly: in either case, or neither, she's been made. It's a distinctive voice, "If anything it's worse. At least on Earth there's an excuse for having all that crap kicking around in storage for the rest of the year. You wouldn't believe the petty contraband I've had to crack down on."