I've discovered if you have a large chest with items inside and place items ontop of another you'll replace the stack inside with the item you dropped on, but the original item youre placing returns to your inventory. Factors i believe are at play here.

I placed the large chest with id:46 character. Im now playing on Id: 289. I still have access to my house and chests (i assume account bound) I've included a short video demonstrating what I mean.

This appears to only work with different item types. If you stack say 100 bandages onto a stack of 60 you'll just reverse positions.