Hermitanio wrote: »
Steps to reproduce:
1. Claim reward from star on one character
2. Transfer to another character through storage
3. Try to open box
4. Receive one of two messages: "An unknown error has occurred. Please try again later." or …
I'm experience the same exact bug. So gong pet package won't open because of one of the following reasons OP listed. For me personally it's "sorry things are really busy right now, Please try again later."