What deeds?
From the official Ottoman land records:
Turkey transfers Ottoman land records to Palestinian Authority
The PA had requested the records to support Palestinian land claims prior to British takeover.
www.haaretz.com
Even before 1917, Jewish and Zionist institutions had purchased large tracts of land in Palestine from absentee landlords, who lived mainly in Syria and Lebanon. These landlords had previously leased their property to local farmers, but were happy to sell it for the right price, without giving a thought to their tenant farmers. Nevertheless, Palestinians view these sales as more legitimate than those that took place during the British occupation that began in 1917.
Under Ottoman rule, a substantial portion of the land in Palestine was registered as state land. Some of this land was later sold or transferred to pre-state Jewish institutions. Other portions belonged to the Muslim waqf (religious trust), and these, according to Islamic law, cannot be sold. However, there was no orderly registration process; ownership was determined primarily using records such as tax payments.