User blog comment:Warmachine375/Why are the Faunus discriminated?/@comment-78.42.242.191-20150603194952/@comment-4010415-20150603201448

Mercury tinted the windows to where it was too dark for anyone to see into the shop, then he killed Tukson and left, presumably changing the sign from Open to Closed.

Assume that the shop had no cameras in it and that everyone assumed that the shopkeeper was on vacation or sick for several days until someone decided he'd been gone for way too long and checked on the shop, only to find his rotting corpse.

Bring in Burnie and Joel the dumb cops, and... this murder isn't getting solved.

Also, I'm pretty sure Tukson being a former White Fang member won't factor into it, like, at all. No one knows which Faunus are members, due to the masks.