Recently, @cbroschinski has added checks for the open access status of articles in hybrid journals (see e.g. #229). Warnings for articles that are not open access can result from different reasons:

• institutions providing wrong data to the Open APC iniative (directly or via Wellcome Trust, etc.) - e.g. when including non-OA publishing fees (page charges) in the dataset or when providing the wrong DOI
• publisher has not made the article open access
• article has some weird configuration on publisher's website resulting in the crawler warning about non-OA status

These issues can be (and will be) fixed over time, so for transparency and for preserving the results I suggest

a) to include a logging function in the hybrid check script
b) to archive/versionize the output of the script