Which, they should already be able to figure out really.
The impression I got was that it was partly that, obviously. They've had one alien invasion (and you're saying it because here it is written, documented history, Scully) so obviously that's a part of it, but that one was pretty obvious, and not entirely expected - right? Doesn't mean there isn't other stuff, maybe less expected. I definitely got the sense there might be some investigation. It's hard to say for certain though, and it would probably mean not doing things on our own.