As of now I do not have a wallet to match her yet, I decided against buying the exact one that was in the boutique because it had a very sharp bottom (it was a flap cardholder and it looked as if something heavy had been placed on top of it and flattened it), and that bothered me. I'm going to ask my SA about a different one, because I definitely do want a wallet from 24s. I'm debating just getting another flat cardholder (I already have two) because I've found that this bag is very limited on space, but I've wanted a flap or zip cardholder for a long time.
The tag and receipt both say: A92990 B05061 NU932 . I'm not knowledgeable on reading Chanel tags and the resources google is suggesting me seem to be a decade old, but I think the color code you're looking for is NU932. I just checked the website's listing for the black caviar small coco handle (so, this exact bag but just in a different color) and the code for that bag is A92990 B05061 94305, so I think the last five characters is the color. Someone please correct me if I'm wrong.