I wouldn't trust the dealer actually did the oil change . FCA claims there is no need for an early oil change but I always do one with a new car . I did mine at 1300 miles and now I am doing it when the oild change indicator reaches about 80 % but that's of course very personal decision and doing it at the computer suggested time is probably just fine.I would change the oil at 5k. The first oil change should be after the first few thousand miles. It is considered a break in oil change. There will be wear particles in the oil.
When I worked the field for an oilfield company, I was in charge of a fleet of industrial engines among other things.
I had routine oil analysis performed on all of the engines and other equipment.
An oil analysis on a new engine would always flag high metal content and sometimes a few other things.
So yes, do your new Jeep engine a favor and change the oil at 5K the first time.
I change the oil on my vehicles and other toys myself as well. The suggestion above about documenting the oil change and saving receipts is a good one.
If the vehicle is new, I often let the dealer do the first oil change so that it is documented by them just in case.
If you keep a journal on the Jeep. Make sure that you note that the dealer did the oil change along with the date & mileage.