So the Pakistanis must have known he was there. "Malik gives Zardari’s message to Saudi king," by Syed Rashid Husain for Dawn, May 8 (thanks to Ashish):
RIYADH: Interior Minister Rehman Malik handed over a message from President Asif Zardari to King Abdullah of Saudi Arabia on Saturday.
The unscheduled visit and presence of the cream of Saudi leadership at the meeting between Mr Malik and King Abdullah set off a wave of speculations in Riyadh. Some observers saw the occasion as an aftermath of Osama bin Laden’s killing while some others linked it to, what they said, was an effort by Washington to reset its ties with Islamabad and Riyadh in the wake of the Arab uprising. [...]
The interior minister’s visit came at a time when fingers are increasingly being pointed in Washington towards Islamabad and its security apparatus over the presence of Osama bin Laden in Abbottabad. Some press reports over the past few days have indicated that Saudi Arabia and Turkey had tried, albeit unsuccessfully, to persuade Pakistan to hand over Osama bin Laden to the United States.