It must have taken some time to get through the bureaucracy at the Goodwill.
Let's say someone dumped it in a collection box. It gets picked up, brought to the warehouse, and researched. First they try to figure out if it works, they plug it in and see if it turns on. By this time they're probably like "what the hell is this thing", and if the answer is I don't know, the supervisor says "put it in the random electronics bin", and then at some later point the stores decide if they can sell it in house or if they have to sell it online.