I got two ideas:
1. Add an option to all chests to distribute the contends immediately, similar to regular gold chests containing tradable loot.
* Temp items would be assigned to a random party member. (Within exp range?)
* Temp key items would be assigned to a random party member not holding that same temp key item. (Within exp range?)
* Augmented items would be assigned to a random party member. (Within exp range?)

2. Reduce chest despawn time. The more chests 'active', the faster they despawn.
** When there are 25 chests in zone, time on new chests is reduced to 150 seconds.
** When there are 50 chests in zone, time on new chests is reduced to 120 seconds.
** When there are 75 chests in zone, time on new chests is reduced to 90 seconds.
** When there are 100 chests in zone, time on new chests is reduced to 60 seconds.
These numbers are only an example.