What paperwork do you keep when purchasing/financing a house

[Brian Matice]

Hey all, here's a nuance question. I have been buying and selling houses for a while now all of which have mortgages associated. I have a giant box (it's a nice plastic box with a cover) with nothing but closing documentation. Seems that each property comes with at least a ream of paper. Now I'm sure that my first mortgage from 20 years ago which has long since been paid can be canned, but I just closed on two properties last month which is only adding to the pile.

Specifically, what documents do other folks hang on to and what do you throw away instantly when purchasing or financing a property?