I’m not sure about over there, but (IIRC) they use machines here with physical balls here, and perhaps variations in things like weight or smoothness/texture might play a part even if slight. Either way I would much prefer to let a computer try to guess the numbers than simply picking one of their ‘lucky dips’ - even if just out of curiosity and a little fun exercise 
I might expand that lottery app I made one day, perhaps could be a good chance to play with Elixir’s Nx 