PLEASE NOTE: as with all seeds, you can never be 100% sure!!
I collect all my seeds personally, they are not bought in, so I am sure as I can be that they are correctly labelled. However, there is no guarantee that they will come true from seed, and for that matter there is no guarantee that they will germinate. However, as a gardener, there is not much to beat the thrill of growing something from tiny seeds, so go on, give it a go!
I advise storing seeds in a dark, cool place - the salad drawer of the fridge, for example. Always take the time to check the germination requirements, as some seeds require cold stratification, some require soaking: some need light to germinate, some will only germinate if covered.