Alright, I apologize to everyone on this thread, but let me get some things clear. I started this thread to ask about secret aid because I had no idea how it worked or what I would see if I checked his aid list. It gets pretty irritating when people then start to act as if I should already know what to look for because it would mean I already knew the answer to my question, or they keep reminding me about his warchest, which this thread is not about.
As for his warchest, the reason why I'm inclined to believe he's out of money is because he was spied on by higher level nations immediately before my war started and they confirmed he was very short on cash.
Anyway, thanks to the people who did talk about secret aid.