I can talk tea if you want. 
If you want to send a pic of the box, I’m curious. 
Go back to the Asian market and see if they sell stuff that is like a tea ball but a little larger. Meant to hold soup ingredients. May be sturdier and or better suited to a large mug. I also use them to infuse mulled cider/wine with spices. 
This spring style ball I’m talking about seems sturdier which is why I now prefer it to the normal tea ball with the latch. I’ll try to remember to snap a pic when I  am home. 

 I'll message you on simplex. 

It'll be a while until I go back to that place. The local h-mart is smaller and not as well stocked.