Both these are unopened and should germinate fine:
"Salad bowl" - which is a curly cut-and-come again type
"Lobjoits Green Cos" - which is a hearting cos/romaine variety [duh!]
Will also throw in the two opened packs if you like. I believe they both germinated for me this spring, but I've moved on to other packets.
(Which reminds me I think I have a few spare lettuce plants I probably won't bother to list - "salad bowl" - as if you're interested.)
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