It seems like the tail markings you're looking for haven't been included in the most popular (recent?) markings pack/haul. My best guess is that the markings were only included in previous/old marking pack/haul downloads that are either extremely hard to find or no longer exist. However, I will save the image you provided and I can share it with others and ask around on some Discord servers that I know have some FH users. I am not part of any FeralHeart dedicated servers, but if you are (or anyone else reading this), maybe ask around in case someone does have those markings for you?
I'm sorry that my post doesn't include a direct solution to your problem, but I hope it does involve information and help that could get you there quicker. The best of luck to you- I know how frustrating it can be to lose FH goodies that are hard to trace and get back. It blows!
Aaa rip! It honestly didn't even dawn on me that maybe it isn't a marking in most markings packs because I've always had it <,3
Tysm for your help! I'll definitely do that. I lost quite a few old items too, so I'll look around a bit more. Again, thankyou for your help. I'll update this if anything comes of it and send a link out if I do for anybody else missing the same items/markings. Have an amazing day/night!