I also live 8 hours from the nearest dealer. When I had a warranty issue with my new bike I took several pictures of the missing bolts and clamp off my exhaust, phoned them and they sent me the parts. They should be able to send you the gasket.
I'll be checking mine now too...maybe it was smoko when the 'technician' was assembling that....'Now...where was i?"...
I have a small piece missing from my right ear lobe...wondered if it was the same scenario???...i was meant to be an Elf tho...hmmmmm..
It's not that tough, service manual says to remove tank, battery, side covers, all I did was remove front mount bolt for tank and lift it as far up as possible, remove runners and filter housing is easy to get at, I didn't even remove reed valve clamps, just rotated them out of the way. sorry about the pics, didn't feel like scanning pages.