Age old story of theft in photography, unless you track down culprit then lay claim to produce proof of original, you have some superb photography stolen!
Live for the day when this type of theft stops.
"Don't set sail on someone else's star." African Proverb
It just seems so easy. Well and it is for the most part. Seem you are familiar with the topic.
Cheers from Berlin
All the way back to negatives not even digital yet, so yes it is an ongoing problem, some people steal! Cheers from Durban.