While Ty continued his normal life without Dustin around, Dustin was sent to South Africa. But by pure chance there was an error with the plane engine, with resulted in it crashing somewhere in the jungle farther north. While the wreck burned down, and with it all the mail inside, Dustinīs package was safe due Tyīs wishes for nothing to harm Dustin. When the fires finally died down, it was the only thing still intact.
It was also by pure chance that the package was found by some of the monkeys living in the jungle before anyone located the plane, so Dustin went missing into the jungle. But what then happened was something Ty hadnīt thought off with his wishes. The monkeys were the ones to unseal the lid and free Dustin from the package.
In a flash Dustin returned to normal size, and learned his new language, that of the monkeys around him. The memories of his new life were built around his rescuers, and so Dustin now remembered being raised by said monkeys, while the monkeys remembered having him around.
This small mistake by Ty ended Dustinīs life as a normal human, as of now he was more of a monkey in his own mind. And with his knowledge of the English language turned into monkey, he would most likely never learn another language again. Dustin lived a happy life in the jungle, with nobody realizing the lost human, as nobody missed him.