FWIW, I still have to replace a chain on my old bikes, I'm not sure what a new one feels like. I bet that chain has low miles on it just by the condition of the bike.
The chain is a small investment but I have been lucky with just some WD40 on the chain and all cogs. After a few rides the chain will look pretty decent. The surface rust will just wash away and I bet your looking at mostly surface rust. I've had chains far worse that and have cleaned up nicely after this treatment and riding. Try to save it first.