You should be able to see the item names when you hover over the items. I added that in because of actually. If it isn't working for you, could you please report it in the bug forums and specify what browser you are on? Cuz then I can look at troubleshooting it :)

Hey everyone, this has been implemented and is in the Beta Testing stage! If you've got a gold account, come try it out and post your feedback/suggestions here: Beta Testing: Mass add items to treasure chests!

I'll lock this since it's in beta testing and there's a thread for feedback and suggestions linked above :)