While I understand you overwrote the files, it may be that there is an issue preventing them from being overwritten so checking the file update date would verify. Additionally, there has been a patch in this area so want to ensure that you have the latest files which the system is expecting.
If users copy/pasted the previous URLs of images or items, this would lead to those images to be hardcoded and thus wouldn't be changed with a storage change. However, without knowing more details, I would be unable to shed light on what's happening.