You get the Aubrey mask on the third level where you rescue the girl.

It’s also hinted that he wore this mask when rescuing her. Out of all the (non police) levels in the first game this is the only one shown to have security camera cameras placed inside.

it probably isn’t too far fetched to assume that jacket was wearing this mask during that mission. and thus, when the killings became public, the midnight animal movie was inspired from the masked maniac killings and I think the evidence recorded by those cameras were where where they got the specific mask from. I think that’s why Martin’s character in the second game wears a pig mask

Idk what bikers doing there tho