It sounds like he interacted with enough people that if he was wearing a cheap mask, it would have been noticed. But professional-level partial-face prosthetics can be had for $40 or so, or a professional-level full face prosthetic cost a few hundred back when I was doing Haunt stuff; they might even be cheaper now. As long as you’re blending it properly, nobody’s going notice a thing amiss, especially during the kind of brief encounters he was engaging in.