I have two unopened cellophane packages of ladyfingers bought last year. I would like to make my annual tiramisu and am not sure if I should use them or buy new ones. The outer bag is long gone, so I can't see if there's an expiry date. I hate to waste. How long do ladyfingers normally last? Even if I opened the bag to taste one, I'm not sure if I'll be able to tell if they're stale as they're so tasteless and dry anyway when not drenched in coffee and mascarpone. Any ideas appreciated!