It will still be in sealed packets, and it is mainly sugar, which is a preservative. So I will eat it when I find it, but may try ordinary butter this time.
I hardly ever throw food out, I bought a bulk buy of jars of coffee at a bargain price, down to my last 3 jars now, best before June 2004 so only 11 years after this! It tastes delicious to me, as good as new. I did try a spoonful of someone else's coffee recently, and didn't like it nearly as much. I expect I will be shocked at the price these days.