That appears to be very confusing, I agree.
Firstly, Brugle is quite correct about an 'unpatched' v2.0 Cleopatra; dispatching the last of the burial goods before the end of the mission could (and often does) cause monument corruption.
With a patched v2.1 Cleopatra, you can dispatch burial goods at any time. It's probably better to dispatch them as you have them, rather than wait.
I suspect that the walkthrough advice is out of date, possibly it was posted between v2.0 and v2.1, but I can't be sure.
"Can I draw you a beer, Norm?"
"No, I know what they look like. Just pour me one."
Cheers !!