Lockers usually come with shims. Whatever is included will be listed.
A master install kit is different. It comes with bearings, ring bolts, pinion seal, shims, races, crush sleeve. Some lockers will include the carrier bearings already. If you have anywhere over 40kish, put new bearings in anyway, it's worth it.
Axle seals aren't included at all. Parts and labor are extra. Wouldn't be a bad idea to do the front ones while you got everything apart. I would recommend Mopar if you can. In the front, they require a little more labor as they're right next to the pumpkin. In the rear, they are on the end of your axle shaft and you have to press off the bearing to get them off. Personally on the rear, if they aren't leaking, may be worth just leaving them alone. If you upgrade rear shafts in the future, sometimes they come with bearing and seal already installed.