I am sorry about this issue you have experienced.
Please visit the Support Page
and file a Ticket to the Support Team in order to be assisted.
Please make sure to include as many details as you can, so you might be able to retrieve your items.
If you don't feel confident writing in English, then feel free to use your own language if supported (Bahasa Indonesian, Chinese, Filipino, Italian, Japanese, Portuguese, Spanish, Thai).
Thank you for your continuous support to the game,
If you have any other enquiries, just let me know and I’ll be happy to help.
See you in game!
Ps: there will soon be a maintenance to fix all the issues related to the Cute Pet System and to the low droprate of Celebration Random Box, thank you for your patience.