Thanx to the forum I only recently became aware of the diary in much detail. From what I have seen in Plutarch, there is an entry pretty much the day or so before Alexander dies.
I haven't looked yet at Arrian for more references. According to Michael Wood- he says that Eumenes included information such as there were "missed days, long sleeps" after extended sessions of drinking and Wood expresses his surprise at Eumenes having had the liberty to pen such info about the king.
It does seem more than his life would have been worth and perhaps would be a reason why the Ephemerides could be "fake"? Either way, why would Eumenes write such things- I mean who would this have been for? Eumenes wasn't writing a biography?
Alexander seems to have the impression that Eumenes was a bit of a scrooge and after burning his tent was proved right.

To be honest the information supposedly from the royal diaries is quite objective in the last few pages of Plutarch- that he suffered from fever etc. so I want to check out Arrian's use to see if Michael Wood is really "telling it like it is"-
Watch this space.

Best wishes,
Dean