Use without indication of source

Hello,

i am relatively new here and would like to ask a question and get your opinion: i have sold a picture three times in the last few days and out of curiosity i used the google picture search to see if i can see where it was used. I actually found two of them, but unfortunately I could not find a reference anywhere... as far as I know, according to Adobe's terms of use this is mandatory, isn't it?

What can I do in such a case? Report to Adobe? Do you even care about something like that? Or should i just leave it alone?

The pictures were sold for 0,33 - 99 cent, that's not very much and somehow I think that at least the source should be mentioned 😕😕

What do you think?

Thanks for reading, have a nice sunday!