i think the lawyer had his guys put a gps tracker in the money barrels.
So do Huell and Kuby. "This guy hit 10 guys in jail in a two-minute window -- all's I'm sayin'."
There can be honor among thieves when they fear each other.
Plus, did you catch the looks Huell and Kuby gave each other when Walter says "close enough" after shaking the barrels and assessing their contents. They took some and Walt knows they took some, but they weren't greedy so he let them get away with it.