If those ‘Scanned adverts’ were as a result of your own individual research and investigation, and photographic skill in reproducing them…then, you have a case for arguing, you hold copyright on the image
If, however, those images were sourced, and captured / cropped / edited by someone else…and then subsequently hijacked… that is plagiarism, and potentially gross infringement of ‘intellectual copyright’… which is enforceable by International Law…unless you are based in China ?
Of course, primary copyright lies with the originators / owners of the adverts…but after this passage of time… they are usually defunct / dead / untraceable…and so that attribution is usually academic
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