Dell B2375dnf 10K toner gives low toner warning at <3000 pages

Hello

This is a genuine Dell 10K toner (Model-id = C7D6F). After printing 2900 pages with an average page coverage, the status indicates the toner is at 13%.

So either the status is wrong or there is an issue with the toner capacity. Is there a way to find out which of both is right?

Thanks in advance
Chris