Locked Crates vs. Elite Golden Chests (question for developers)

[Energizeric]

We have been told that the chance of getting a mythic or arcane item in an elite golden chest is slightly lower than getting a similar item in a locked crate....

There are currently 8 arcane items that can be found in locked crates:

Hammerjaw
Glacian
Samael
Singe
Hooks
Maul
Kershal
Shard

Since we do not know the exact percentage chance of getting these items, let's suppose the chance of getting any single one of these arcane items is X%. That means that the total chance of getting any arcane item would be 8X%.

Does that mean that the chance of getting an Arcane Shard in an Elite Golden Dragonscale Chest is slightly less than X%, or slightly less than 8X% ???

Because if the chance of getting an Arcane Shard in an Elite Golden Dragonscale Chest is slightly less than X%, then the chance of getting any Arcane item in a Locked Crate is actually more than 8 times higher than getting one in an Elite Golden Chest, since all types of Elite Golden Chests only drop one single type of Arcane item.

On the other hand, if the chance of getting an Arcane Shard in an Elite Golden Dragonscale Chest is slightly less than 8X%, then the chance of getting an Arcane Shard in an Elite Golden Dragonscale Chest would actually be much higher than getting that same item in a locked crate.

So which is it?