Oh thank you @Katrina_Moore ! I made them in a previous project I shared here
DIY Project Sharing | Mini T-Shirt Envelope Style Gift Box
https://design.loklikideastudio.com/share/1930929515896774656
I also made this other type
DIY Project Sharing | Self-assembling Pizza Gift Box
https://design.loklikideastudio.com/share/1931090020284243968
They are from the 
Project Sharing Beta period. We weren’t quite sure about how it all worked so I don’t know if they are actually shared or not, they may be not. So if you want to try them and you cannot open them, just tell me. I can upload them to the official library as it was my original intention.