Not being able to look at one Ken, I'm trying to work from memory so I may be confsing this with another. I
think that you may be overlooking the screws on the rear (by the glass). Some of them are semi-hidden. I don't think there are clips on the backside, just screws. I could be wrong. If no screws then it has to be clipped. Start gently prying and looking for the points of resistance. That should make it clear how it's held. Like I said I think it is recessed screws but not 100% on that.
Thought a little more and I think it may be the same type clip as the front (flat clip about 1/2") they are just really tight. It's either that or the screws.
Hope that doesn't confuse you more. Best course of action is look for any semi hidden screws or covers on the cowl that would pop off exposing the screw. If you don't find anything, start gently prying it trying to find attachment points. No screws means it's got to be clipped (which the more I think about it, the more I think it is clipped with those funky things Ford uses now.)