What shoudl be done with a deceased relative's documents and bank statements?

My uncle (father's brother) passed away intestate 2 years ago. He had no spouse or children and was living in assisted care at the time. There were 4 siblings who have all passed, my father was the eldest, but I have 3 cousins who are my aunt's children. The person who had been acting as my uncle's POA has now turned over to me all documents, forms and other papers she had in her possession. The bulk of them include bank statements, checkbook, bill receipts, Medicaid forms and the nursing home documents, among other items. I am not sure what to do with them - keep them another 5 years or shred them? As far as I know, there has been no activity or inquiry into his business for quite some time, although the POA stated she is still receiving monthly bank statements from his checking account. The last statement that was included in the papers given to me showed there is a little over $15K in the account. What should be done about that?