I have never tested germination on stratified seed, but I know otheres here have done that.
I always just buy fresh seed and plant them asap, and then my germination test is in the spring
One thing that I would do on this questionable seed is just randomly select out several seed and with a sharp knife split them along the seam to reveal the embryo and check the inside of the seeds for signs of disease.
If you have nice clear-white color inside with a well developed embryo (see examples below), then I would sure go ahead and plant them.
Also - keep in mind that seed that has been stored improperly (like yours has)... may play some tricks on you germinatoin wise. For example, you could have only 5-10% germinate this spring, and then the following spring the majority of those that will germinate could come up then.
Good Luck !
TNhunter