joeyboygolf: Don't get too fussed about it. There really is not very much difference to hear if at all.
The most important thing is condition but of course it's your money.
100% agree. Do a sound proof and if they sound, and the price is good, take them and enjoy!!!!
To be unworried you can take them to your local dealer and do a check. I got my four BL8000 in these way. They are from 2001 more or less and are sounding perfect!!!!!
(after a little repair, not too expensive)