i'm not sure how but i do know that the doors can be adjusted to pull in more. also, since our cars are getting older, the seals are wearing out. there's no un-doing the damage without replacing them but you can slow it down by using the silicone based lubricant specified in the manual which helps slow dryrot and helps them maintain their flexability.
as for the white box, i think its time to pull out the trusty roll of duck tape
