Did you read my answer or do like repeating yourself
They are correct (in a matter of speaking and there is no aftermarket for this)
Ask them for the SPRAY PAINT touch up cans.
If they still say no, I'll get all the color Volvo part numbers for you for their spray paint and you can shove it up the parts person's rear end!
Silver Bright is 932
Titanium is 934
I don't know the others off the top of my head
Mystic Silver #426 (body color) which can be ordered in a touch up bottle is very close to most of the wheels and if you're just touching up the lips you can try that first.
...and this is really in the wrong forum to get quick answers