So here's the deal. I dabble in buying and selling car parts, a little for fun because I like pulling them apart, and a little to make some money on the side so I can buy things for my car :)

I sold a factory stereo from a Ford on Trademe which was working perfectly well in my wifes car two months ago and perfectly well when I re-installed it the day before sending it to its new owner to be sure it was all ok.

I packed it incredibly well and sent it off to Auckland happy.

A couple of days have passed and now Ive received an email from the buyer to say the installer has said its faulty and can I ring the installer. I do so to find out yes it turns on but it also shutsdown after entering the code. My initial thought is the code is wrong, but he wont let me check the code I gave is correct (which I can do) and wont tell me anything more but say the unit is faulty.

Im aware its a second hand deal on TM and techincally the buyer has no comeback but Ive been stung by people who have just told me to get stuffed when Ive received damaged goods and I dont want to do the same to someone else.

But how can I be sure the unit hasnt been damaged in the post, by the buyer, or by the installer ? Can I claim insurance from NZ Post ? It was sent T&T but I havent checked their website, and how do I prove it was working previously ?

I have another unit here I could swap it for, but I dont want to end up with a unit I cant sell which I had no part in damaging.

Any thoughts ?