Thank you :) you can assign emptys for Lattice box to control the animation, when you selekt the Lattice object than switch to the edit mode and select some controlepoints and hit crlt H to create an empty, which influences the Lattice box. than you can conect the emptys with some bones of an armature.

Nevermind, i had the exact same model downloaded but this one wasnt rigged :)

The empties controlles the Lattice-objekt and the bons are drive the empties, i have connected the empties which controls the Lattice objekt with the bones of the armature, first select the empty hold shift and select a bone oft the armature ( the armature must be in pose mode) then press crlt p / Set parent to / Bone.

create a Lattice object, select the object and go to the edit mode, than select some verts of the lattice-object and press Ctrl + H, so i cread the emptyes which influence the lattice-object.

I hope that helps