I see you also say you run a rescue. I hope you have very strict quarantine practices between your breeders, new acquisitions and the rescues.
Jungles are a co dominate BCI morph where both the pattern and the color of the animal is affected to a varying degree. While there are 'markers' none of them are 100% and with the color changes neos tend to go through the distinct coloring isn't even a given unless you're looking at an older specimen. It's best to get one from a breeder who has an excellent reputation. I have Jungles, but I also have quite a few non Jungles who look more jungley than then the real deals. It gets even messier when you mix them with the other morphs. Bottom line with them is that they HAVE to be traceable back to the original Lars Brandle Swedish stock or they're Not a Jungle.
I believe there's a thread here some where with some pictures and markers, just run a search here in the boa forum. If you see a thread started by AwesomeApril check it out, she has some beautiful low expressions & she takes much better pictures than I do
Here are two of my Jungles and a non jungle litter mate for reference ~
The first one is JB
The second one is JB with Link on top of him
The third one is Link & Zine, his non Jungle litter mate
& the fourth doesn't show much (but it's cute) is JB & Link again