i dont know what chapter but when u climb down the ladder
take a u turn and there it is on a table is this any help?

anyways you might need to go to a walkthrough for that

if that doesnt help im sorry

Amazingly dumb...

JUST BUY A TREASURE MAP

Just before the cutscene where you accidentilly choke Ada, behind the ladder is a table
and the staff is there. :P

you only need to go to youtube and search
"resident evil 4 proffesional walkthrough"
the one by pyshchadelicsnake and after i wathced his walkthrough i were able to complete
the game 43 times already.

you find the staff of royalty in chapter 4-3 at the start of the mines