3 year old Grass Seeds

 I bought some grass seeds 3 years ago for a major re-grading and re-seeding
project I was doing at the time.  The seeds, which were a local blend mixed
to suit my immediate area and climate, worked very well, giving me thick
growth and matching my existing lawn.

I cannot buy these particular grass seeds anymore as the local garden store
when I bought them has since gone out of business.  However, I do have alot
of these seeds left over from my project 3 years ago.  My question:  Will 3
year old grass seeds, stored in my cool basement, still be good for seeding
if I use them now?

Thanks.