AFAIK, you have to go to the office holding the records and ask for them. They did put it online, but found out that total machine readable transparency hccesdible to every scammer on the internet has downsides as well and reverted to the old system.

Disclaimer: I’m no Swede and I do not have any special knowledge about this. My brain is just wired to hold on every bit of information unrelated to my life and drop every important or usable info. I’m 99.9 % convinced that I came across this story several times in my life on different occasions from usually reliable sources. And the last time I heard about this quirk of Swedish bureaucracy might be 15–20 years ago.