Head is probably somewhere in the shed.. seller has a habit of not knowing what goes with what.
Also any seller that states " looks complete" is using this as a cop out.. means it isn't but they aren't going to say. Another favourite is " haven't plugged it in to see if it works or not".. biggest lie in the industry.
$550 for a cabinet?.. so the market is someone with a head sitting around looking for the missing cab?

Don't like the odds of that one..