Hey Ayiza,
Thanks for getting back to me. One of my group mates had the same message as me, one thinks he had the same message from memory but can't currently check, and I'll check with the final one - we've discussed the message I got, but they hadn't confirmed directly that they had the same yet.
I was the one who took the Black Mask out of the Group Storage ahead of the rollback. I was however not the one who got the item in the first place, as mentioned above, nor do I think I was the one who last used it/placed it in the Group Storage. I don't remember taking anything else out at the time, but I can't say with 100% confidence that I didn't!
If you need my username or group name, I can supply that privately, so let me know.
I think it would be a failure on my part to not use this opportunity to say that there really isn't any item that shouldn't be returned to their owners, although I appreciate I have no idea the processes involved in returning these items.
And finally I really appreciate you taking time out of your weekend to respond to me. I hope you enjoy what's left of it!