If you have (6) donuts, you can use the Mystery Box multiple times and keep every item for only (6) donuts.
- use the mystery box [view the item] don't not click anything...
- double tap iPad power button and turn "Simpsons Tapped Out" app OFF
- go back into Simpsons Tapped Out app and go back to Mystery Box. (you should still have your donuts)
- buy the Mystery Box again...
- double tap power button again and close app.
- go back into Simpson app and buy mystery box again... (donuts should still be there)
- check your inventory... You should have all mystery box items with donuts still in tact.
Worked for me up to (5) times until I got "white fences" in the mystery box.
- squeaky voice kid
- angel topiary
- white fence (3)
"after I got the white fence my 6 donuts were gone when I went back into the app, I believe since the white fence is considered (3) items it ended the glitch or whatever you wanna call this"
Please someone else try this out and confirm because it worked for me first time and when I get (2) more donuts I'll have enough to try it again. I only tried this in the first place because I know it works for other games like Draw Something in order to get better words. Thanks