(hope this passes as on-topic - its very important for bioinformatics as much as other domains)

Does anyone know journal instances of retrospective Gold Open Access (Gold OA) Article Processing Charge (APCs) payments? What I mean is cases of where the article was Green OA in intial PubMed (i.e. text on the publishers site) but a subsequent APC was paid to promoted to Gold OA (i.e. the text was later passed to PMC and EPMC)