Rubbish and treasures

Mum decided it was time to clean out under the house - she was convinced there was big piles of junk under there - some boxes have not been opened in 9 years since they moved - more treasures than junk found. Major problem is my dad love keeping boxes in case of ... In case of what none of us are sure - or things that would be great for packing - think we could almost pack up a 3 bedrooms house and still have packing supplies left