We are using Splunk Add-on for Box to get Box logs.
With this Add-on, it appears that only [Events, Users, Folders, Groups] of the Box API endpoints is available. Furthermore, it seems that only "Standard" columnscan be retrieved for each API. (API Reference - Box Developer Documentation)
1. Is there any way to get logs from other endpoints like COLLABORATIONS or DOWNLOADS?
2. is it possible to retrieve all available columns, for example FILES(FULL)?
I would suggest you look for this in ideas.splunk.com. This seems to be an enhancement request in the product itself. Once the required number of upvotes are there for a specific idea, it'll be considered to be added to the product.
--- If you find the answer helpful, an upvote/karma is appreciated