To spicen things up I ran 372 shards and encountered lots of weird glitches… the worst was that in two out of the three very first level 10 shards we did I missed out on it.
You will only get gear back from devs which was generated in the game before, so if there was no chest, then it’s gone (or like in my case, I awoke dead at the dungeon entrance after reawaken, 2 popups covering each other and I was unable to press anything or use the menu before relogging - then they were gone).
Other than that, as other said this gear is more or less worthless anyway… running level 30 content before being there is not a good idea imho. The gear you get is overleveled in 2h or less. You can level from 20 to 30 in a weekend via quests and events. The time spent inside shards is yielding less xp than the same time spent doing quests and events plus you can’t really contribute with low level weapons (many groups don’t need a healer on lower shards though).
If anything then we run normal dungeons with our leveling members, these get you as well some xp (10k for the first random dungeon in the queue you do), as some gear in the end, as some real dungeon experience, because with levelscaling you are not just dragged through, but can actually contribute.
Gearing up via trades is very quick after that also, so actually no need to hurry with that in the leveling phase (also: secondary stats and bonuses like the xp one don’t apply if you get higher gear than your level is… the armor is scaled down as well. So you are better off using your leveling gear during the leveling phase, not trades).