found shares !

hello everyone
can some kind person help me
my neighbor passed away 3 weeks ago i had the keys to his home
he has no living relatives and had instructed me to clear the house when he goes
as to his word all is gone i ordered a skip all his photos paper work small items i all gone
i left the big item for the council to remove
i `ve know him for some 15 years and in all that time know one visited him
now to the shares which i know nothing about
i know i could never claim them as his name is on all of them
some dating back to the 80`s
here goes
500 shares in TSB
300 shares in Halifax
100 shares garner plc
200 shares in Lloyds

theses shares were bought at a price of 25p in the 80`s
what am i suppose to do with them
worthless of not ?
thank you

found shares !