Pea Seeds

They will be fine  :happy:, maybe germination will be down by the odd pea or two but so many other things will affect them, it isnt worth worrying about.   There are very few things that go off quickly - parsnip is the main one where you have to buy new seeds each year. 

But, unless you got them at sale price, I wouldn't buy seeds from there again.  They shouldn't be selling you out of date seed!  V. naughty!

Try germinating a few on wet cotton wool/blotting paper - will tell you if they are viable.

Next year you could save some of your own peas to use as seed then they'll be as fresh as possible!