Hunting low level monsters for equipment drops

I think the anti bot thing prevents higher level characters from finding equip drops from lower level mobs, but I'm not sure what the level cut off is - just wondering if anyone knows how this works?

I want to hunt for some Lightning earrings (only drops from Iron Boars, which are level 24), and I want to know what level range the character should be that I try and find them on.

Everything but the exp should still apply, so level 29 would be your limit before the drop reduction kicks in.