In all likelihood youll probably just end up with new rod, reel, and bait for free.
Brownie points with ^^^ for being a good Samaritan.
Maybe the owner will show up.
If nobody shows up and you cant in good conscious keep it. Donate it to a kid you know who wants to learn to fish.
Most guys would just keep it without attempting to find the actual owner. A very good thing youre doing here.