I know this won't help you now but there is a clue that the item description isn't accurate. On the top it says "like new" yet later in the description he states that the handles have paint worn off. The pictures also verify that the exterior is not "like new". This may not have been intentional but it shows that the seller is unable (or unwilling) to give an accurate description of the item for sale. I would have stayed away from this auction for this reason.
I believe that you should discuss your issues privately with the seller before taking more drastic measures. To me "like new" implies that the condition is as if it were new inside and out. That includes the issue concerning the replacement speakers because the jackplate clearly states what kind of speakers are in this cab when it's "like new". Just keep in mind that this might not have been an intentional scam so be polite but firm with whatever stance you take.
I believe that you should discuss your issues privately with the seller before taking more drastic measures. To me "like new" implies that the condition is as if it were new inside and out. That includes the issue concerning the replacement speakers because the jackplate clearly states what kind of speakers are in this cab when it's "like new". Just keep in mind that this might not have been an intentional scam so be polite but firm with whatever stance you take.