really? they blacklist serial numbers?
why?
No, they don't blacklist, yes you can feed it into this site to double check any claims the seller may be making about the coverage on it.
Have you ever bought used computers before?
If yes, did you have these same concerns?
If yes, how did you address them?
Take that answer, plug it into a search engine with "blah blah, for Mac" or "blah blah for OS X"