Lots of credit to boe6eod7nty. http://pixelpapercraft.com/papercraft/52222810eee0218e38000074/trapped-chest-advanced

http://pixelpapercraft.com/papercraft/51cf14fb25059c142a000005/opening-chest-advanced

The texture of the chest is different if you look closely where the latch goes. Trapped chests are like redstone signals. If you open it, the chest will send a redstone signal like a pressure plate. You can see some redstone at the part where you connect the latch.

Works just like the regular chest. This design was made for a new animation coming soon!