From what im reading you have seroius problems,there are a number of things that can cause ratteling,none are good or easy fix'es,you should bite the bullett,call the supplier back & tell them to forget the mid drivers they are sending you & ship back everything at once,no delay's.
Shipping damage to speakers is always one of a few things.
1 Cabinet damage,this is the easiest to spot.
2 Crossover damage,not visable from outside. where parts are broke off the board or the entire crossover came loose from its mount,keep in mind that alot of mass production speakers have their crossovers simply stuck to the inside wall with hot glue
3 Driver damage,this can come in many forms & damage can be different in all the drivers in the speraker box.
Magnet damage,this is where the shipping company dropped the package so damm hard that the magnet has loosened or flat out came off the back of the driver,if this happens its a death sentance for the driver.
Loose connection from voice coil to the basket caused by rough handeling/dropped kicked,this can cause crackeling & the sound to break up.
What i dont understand is the damage to the surrounds on the mids,ive shipped a ton of speakers all over the globe & have never seen or heard of the damage you describe,i cant even see this sort of damage happening in shipping,without there being some kind of evidence that the speakers face was not properly packed & the box was allowed to slam down directly on the drivers face
I think these speakers had serious issues before they were even sent to you,alot of companies & private sellers are notorious for knowlingly selling damaged good's to buyers,that way they get full fare out of their stock & the shipping company's insurance picks up the tab.
I'd bite the bullett & send em back on the spot,you can dispute any customs/brokerage fee's on returned items easily,also if you notified the shipping company about the damage as soon as you noticed it like you should have there will be no return shipping charged to you.
