publishedCheck brings back false positives
Several emails were sent out for articles that are not actually available in Europe PMC. The publishedCheck just checks if the query has a hitcount, so it counts as true even if the only result is an abstract, not the full text.
For example: https://www.ebi.ac.uk/europepmc/webservices/rest/search?resulttype=idlist&format=json&query=AUTH_MAN_ID:EMS80809
{"version":"6.1","hitCount":1,"nextCursorMark":"AoIIQLvAkigzOTI0NjMwNA==","request":{"query":"AUTH_MAN_ID:EMS80809","resultType":"idlist","synonym":false,"cursorMark":"*","pageSize":25,"sort":""},"resultList":{"result":[{"id":"30531311","source":"MED","pmid":"30531311"}]}}
Possibly this kind of query would be better, please test:
Otherwise please switch back to just searching for PMCID, the false positives there are still full text and thus less bewildering.