2006 Jeep Wrangler TJ Easter Egg?

The best I could guess is that eventually you'll find a rubber duck somewhere in or on that Jeep.

Now I'm wondering if Easter eggs come from ducks, not rabbits.

There should be a "hidden object", not really an Easter egg, behind the front bumper, under the sway bar. It's a metal tag with some of the codes about your Jeep's build stamped on it. You can see it by looking up under the sway bar, but removing the sway bar cover lets you see it right side up. You can look in the FSM to look up most of the codes.

Jeep Wrangler TJ Factory Service Manuals
2006 TJ FSM

My last Jeep came with this “Easter Egg”

Yes, old thread. My rental during a vacation to Yellowstone and Grand Teton was a 2023 Gladiator. When starting the Jeep, a small message would appear on the display: Since 1941. I thought that was interesting and good to know that maybe, just maybe someone at Jeep knows a little history. An online search for the message resulted in many links. This one was helpful.

https://www.mattbowerscdjr.com/jeep-hidden-easter-eggs/

All of the Easter eggs in my jeep are difficult to find-unless you know precisely where to look or what to expect. The secret 7 slot grille. The mysterious 4wd actuator handle. The flat, nearly 2D fenders. The (in)visible screws and bolts holding the interior together. The allegedly folding windshield. The impossible-to-spot spare tire. The analog gauges (the camouflaged accuracy of the fuel gauge in particular). The playfully hidden (nonexistent some would say) driving nags and nannies. The stealth technology of lethality hidden within the entire front vertical surface area, especially for insects and small birds (and one falcon, alas). The ignition key doubles as an encrypted map of a number of mountain ranges when you look at the "teeth". The "refrigerator light" action of the engine cover, which retracts the moment you lift the hood. The anti-gravity mechanism ensuring you must still apply the accelerator on downgrades.