What's a good place to hunt for Berilads?

[TrieNoir]

I've gotten a few here and there, and I notice that there's a very wide range of locations that they drop from. What's the best place to hunt for them?

Thanks.

[JC10001]

White Beast S2... in the box behind the ice pillar at the end.

[desturel]

There are a group of boxes on Block 5 of Military Subway S that drop Berilad, but that mission is a PITA to solo for hunting items. I can't think of any other boxes that drop it as consistently though.

White Beast S2 drops Suffad not Berilad