It appears that Dude4 has left the building declining to provide pressing particulars shedding light on of his alleged "inheritance". In the least he might have explained how he managed to know that an "old property deed" was missing before it was discovered not missing.

The last a scenario I recall in which an old property deed was central to the plot was in the Marx Brothers 1940 flick "Go West" on the back of which Chico inadvertently wrote an IOU for ten cents and gave to the bad guy saloon keeper in payment of a mug of beer scarfed and quaffed by Harpo.