Few questions about finding items after battle

[Corwin]

What are the chances of finding items on the battlefield on dead enemy commanders?

Does it depends of the item? (more valuable - easer to spot maybe?)


Does it depends on how many of your own commanders have survived the battle? (the more people looking - the better chances?) Do attributes of your surviving commanders matter?

Can you still find the item if enemy commander fleed and died while retreating after the battle? What if it was idep provinse?

So basically - what is the formula behind this event?

Thanks a lot.