Newt keeps several Bowtruckle in his suitcase zoo, but he’s taken a particular shine to Pickett, often carrying him around in his pocket to keep him warn and because that particular Bowtruckle has attachment issues.
Resembling a mole, the unnamed Niffler is quite the kleptomaniac, stealing anything shiny it can get its little hands on.
As for the Niffler, if it’s gotten loose again, the nearby jewelry shops and banks will be in trouble.
Bowtruckles are good at picking locks, so perhaps Pickett will help Newt out if he’s been chained up by a nefarious individual.