https://api.dropbox.com/1/delta?include_media_info=False v1 null entry value

Hi Ashley, the null metadata indicates that the item is deleted. You can find more information on this under the "delta entries" section of this endpoint's documentation:

https://www.dropbox.com/developers-v1/core/docs#delta

There's a blog post that shows some logic for this that may be helpful here:

https://blogs.dropbox.com/developers/2013/12/efficiently-enumerating-dropbox-with-delta/

Also, I should note that /1/delta is an API v1 endpoint, which is deprecated. The equivalent functionality in API v2 is /files/list_folder[/continue]:

https://www.dropbox.com/developers/documentation/http/documentation#files-list_folder

https://www.dropbox.com/developers/documentation/http/documentation#files-list_folder-continue

Thanks Gregory. We have updated to v2 but still have an outstanding thread item so still using v1 (https://www.dropboxforum.com/hc/en-us/community/posts/207754083-500-internal-Server-Error-https-api-dropboxapi-com-2-files-list-folder-continue)

Thanks again

Just one other quick question. Why did deleted entries show in the first place? Could the user of been working/deleting files while i started the initial request and moved on to the next cursor? 

Yes, that is one possibility. There may be other cases too, but in any case your app should handle it the same as described in the documentation.