In the movie Hachi: A Dog's Tale we have seen in the beginning of the movie that dog was being parceled. So whom it was parceled to and why didn't the owner for whom it was parceled bother to search for it? So was there some other significance which I missed in the movie?
In the movie the dog escaped from the train. Depending on where the dog was sent from and when the dog was declared missing from his package the search area could be immense. Furthermore the owners probably could have filed an insurance claim and gotten a new dog for free. That's definitely easier than searching for a missing puppy around potentially hundreds of miles of track.
At the start, when the label on the puppy carrier gets torn, you get a brief glimpse of the address. The puppy was being sent to a person (perhaps) named Stephen Towers and his address was 121 Jordan Ave, Bedridge, RI 02895. Bedridge appears to be a small town, so if the person was still there, he would have seen the fliers. Therefore, I would guess that he had already left the place at the time the puppy was sent to him from Japan.