well, if you had asked me that a few months back, i would hve said look for the larger shineyer brown, uncracked ones.
if its cracked or squashed then its bad.

i would have said the pale/greish ones may not be good,

however, i got some skywalkers from dutch passion, and to look at, i would say they deffo looked below average, small and pale....but they had 100% germination and grew into beasts, so there you go.

seeds keep quite easy, aslong as they are kept away from moisture and reletivley cool, they will last.