As the message marks, only one box is received but with another color (I suppose it's new), and from that box you only receive one Pokémon, but nothing more than that.
Important issue, If you take the mission, and stay afk for too long, the mission is cancelled. And you will have to wait
- You have failed the mission due inactivity for more than 45 minutes, you can try again tomorrow.
Dittopog
After 12 years ago, 322 levels and exactly from this date: Dec 03 2010, 23 : 09 GMT, for the first time I finished PAPOI with one of my characters.
(happens) Misdreavussmug
Credits to: 'Evelin' who used the levers for me