I wouldn't do that. They are the UFO style motors.
definitely not. he's trying to get what he paid for them (5 years ago)
Ask him to play them or if he can't at the very least take a DMM and check the coils. Set it to impedance (the little ohm symbol) then put the probes in the terminals (one set at a time) and it should give you a reading for the coil which should be like 1, 2, or 4 ohms.
That style BTL was made up until this year or the end of last year. I don't know how old they are, but, at that price, I would just get new ones.
Oh no man, they are like 450-500, depending on what options you get. Here's the new ones: https://ssl.perfora.net/www.ficaraudio.com/sess/utn;jsessionid=154e25a34a0d1a5/shopdata/0050_Speakers/0010_BTL/product_overview.shopscriptarent they like 800 a piece?? or more 1000??