Negotiating with companies is just beating around the bush imo, they'll probably give you a lame credit, like $25 LOLWUT.
I would try with them, and ask for a new receiver; if they don't dispute with paypal and say the item received wasn't what was advertised. If you don't want to be an asshat, try to get what value % you think is fair.
If I was a HKFANBOY like you and didn't get my engravings, I would demand at least 50% back of my cost
Engravings for those alone here in Canada (First finding a source) second, the cost would be over $100 bucks, + Shipping to them, and back to you.