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Bump. If no one gets it, I'm gonna give an example from The Legend of Zelda: Skyward Sword: you go to the Sandship, open a chest and get the key that was inside. Next you go to the past (hundreds of years earlier) and the chest is inexplicably open and empty.
That's the Timey-Wimey Ball preventing an Object Loop class Temporal Paradox- you can't take it from the chest in the past because it wouldn't be there for you to have taken in the future.
If it's Justified, the chests might contain a Place Beyond Time for holding important items, or it could be that future you hasn't come back and put the item in the chest for past you to have found later yet.
Edited by Scorpion451
In a game featuring Time Travel, you get an item (say, by opening a chest) in the present and then go back in time to the same area. The item you got in the present should be back there, but it isn't. Is there a trope for this?