I found a package of Lupin seeds that I misplaced a few years ago. (packed for the year ending 2001 is indicated on the package) With nothing to lose, I nicked the hard shell of each seed with a razor blade and did the presoak in lukewarm water for almost an hour before setting them in the soil outside. It's kind of funny to go to such trouble, as they grow wild quite well along the highway here so it would seem the seeds would just take if simply tossed on the ground!
I hope they take. I've had good luck with them in the garden before, but I've always bought them as young plants from the garden center. The seeds I have are called "cruickshankii Sunrise", and they are a really neat mix of blue. I'll try and post a picture of the seed package.