Numbers stations are there to baffle and confuse us. Some think they are for talking to spies in the field using a one time cipher pad, other believe they are reporting conditions back to the mother ship of some superior lizard like race of space goonies...flying about in invisible ships causing hell and havoc all over the planet.
It is important to note that NEITHER THEORY has been proven, and consequently they could both be wrong.
One night I heard "taco taco burrito gordita enchilada" and I thought it was some kind of secret code, but in reality it was my neighbor ordering from the local Taco Truck...
K9DOG says WOOF.
No, neither has been admitted
, but the fact that these signals have been DF'd to known government installations is a bit of a giveaway as to the most likely! Your own FBI have even fully documented and publicised prosecutions of cuban agents caught with transcripts of these signals and the pads/software to decode them!
My own research into Blue Aspidistra took me into some rather dark places concerning these signals!