Doing the right thing.

I need some help making a decision.

Somebody I know contacted me asking for advice on a finish nailer purchase. I gave him several options and then remembered I had one new out in my shop I wasn't using. I looked up the lowest price on ebay $150 and gave it to him for $120.

Sent it via USPS priority Feb 4th. Hasn't arrived to his house. USPS says we're screwed - they lost it but don't offer anything at all.

I have a couple used finish guns or a new brad nailer I've offered.

I don't know the other guy's proposed solution. We haven't talked about it since yesterday. I'm not sure I'm on the hook for the entire $120 since I did everything right. I definitely don't think he should absorb the entire cost either.

So, what do think?