I am not aware of any paid service to find out, but there are takers for everything -- maybe something like TaskRabbit? Nowadays there is less of a Swedish passport check schedule for international arriving trains than scramble teams based on what they think is going on in/via Copenhagen. But it's very easy to get real-time updates if wanting them. Flying SAS to Sweden from CPH remains mostly unchecked.

What's with some people insisting on taking SJ to go between Sweden and CPH instead of Oresundstag? Beside fare difference, less busy, first class snacks + coffee/tea/water, and SJ Prio points.