Longevity of Baby Brine Shrimp Eggs

Hi. I have a can of opened baby brine shrimp from a couple to few years
back. It had a plastic lid on it while I wasn't using it.
Well, my piranhas have bred on me again and I wanted to start hatching the
baby brine shrimp again. I put in a litre (close to a quart) of freshwater,
about 2 tablespoons of non-iodized salt, about a 1/2 teaspoon of eggs and
aerated it for over 24 hours. After that, nothing. I had two batches
going and not one produced any live bbs.

My question is, do the bbs eggs go bad after a while of being opened (not in
its sealed tin container)? I'm basically doing the same thing I was a few
years back but I at least had success back then. I don't think I'm doing
anything wrong so I'm suspecting it's the eggs.