Well, for me it was the box. The pump was dry, the lines looked dry, but the box was wet, and it dripped fluid off the pitman arm. I put new lines on anyway - they are only like $20 each.
Check the pump first. Check underneath the pump, feel under it. Check for oil on the pulley and belt. If those are wet, it could be your pump front seal. If the pump is dry, check the lines. Then if all that is dry, it would be the box I would guess.
How many miles on your Jeep? I've got 175K, and my pump was still dry. So, based on my highly technical analysis of 1 Jeep, I think the box leaks before the pump does.