X Files Scene

So on the most recent podcast with Joe Rogan, Diana Pasulka mentioned that the area they searched for UFO debris was featured on X Files as someone on the set was in the know…

Question is does anyone have that scene, episode or location she was talking about, with it being “familiar” to xfiles watchers?

So questions are, what else on X Files is true, how they portray greys? Abductions etc?