Hi guys... I had a question on Dry Box. My dad gave me his dry box which has many small moth(dunno how to spell) ball right at the bottom of the box. It is a 15 yrs old dry box.. I would like to check with you guys out there whether do I need to change the small moth balls inside? If need to change, where can i buy it? Or do you think it can still use it? Thank you in advance. =)