Are there also other places then on blocket.se to check for possible available cars?
Blocket.se is by far the largest marketplace in Sweden for used cars.
However, there are numerous groups on Facebook dedicated to Volvo classifieds.
It is a bit harder to find the really good ones and it is generally safer to use Blocket.se but in your situation, I would give Facebook a try.
Having someone with a Swedish drivers license to take ownership of the car and prepare it for export does in my opinion makes it a lot easier for the seller. The Swedish export process is not that hard but many would refrain from the extra paperwork and rather sell to someone local.
Good luck in your search!
ALLT ser bättre ut utan LED-ramp
780 -90, XC70 -13, 945 -98, V60 -12, GMC Sierra -96, 944 -91, 945 -95, 740 -88, 740 -87, 265 -76