Needle in a haystack

When my dad passed away, I now understand how important it is to have a very meticulous filing system. Yesterday, I spent a few hours pouring over his items trying to find traces of his ATM cards, his insurance, everything.. it was like looking for a needle in a haystack... sometimes it felt like an episode of CSI.. cause we find a piece of paper with a 6 digit number and immediately we think "could this be the PIN number to this ATM card?".... I'm still going thru..