Today I pulled out my old sub to drop my new one in and noticed there was still some dust in the box. I wiped it out and swept it the best I could but there was still some more. This is a sealed box. Possibility of damaging the new sub ?

 

Unless it is metal dust, possibility = 0



No sweat.

 

Any foreign material inside the box could potentially get inside the sub and destroy it. Especially if you have a pretty open basket on the sub. Make sure you clean it all out the best you can before sealing everything up.

 

dust so small you can't wipe out is not hurting anything.