I'd go ahead and try 'em. Sometimes they'll surprise you. If space is an issue, do a germination test. Looks like the record is thousands of years.

Also, here's one example of the reference you were looking for.

I found an old dill packet from 1990 and planted them this season, and they are growing like crazy! Always worth a try.

I too have had very old seed packets that I have forgotten about & they were 10 years old & they grew. who would have known? I say give them a go - you may have to baby them to get them started but sometimes it is worth it.

I have a patio full of seedlings , some from 2001 and older.
I sowed lots of them thinking only a few would germinate...NOT! I also have many that I germinated in zip lock baggies tucked inside a moistened coffee filter. Just plant them!