I'd also like to see the drop rate increased. I think it's a sign of a problem when people who aren't even interested in the mount can end up with all the field notes but those actively seeking them out can end up missing out again and again and again.

Adding some of the rarer field notes to lockboxes strikes me as a solid compromise. It'd also spread people out more rather than leave a bunch of people only entering the instance in the hope of pursuing one specific FATE.