Need a bit of help before offering someone some money for one.

I know of someone breaking a focus RS and have said I'm interested in the 'box but he's come back and said what would I offer for it. Now obviously in an ideal world he's acceptn £50 and a bag of jelly babies but I dont see that happening to be honest

I saw one go....... well got out bid on one on ebay last week that went for £230, but dont know whether thats an average price or a fluke low price.

Anyone any idea what the second hand value of these boxes is?

Ta