I have a box of OPKs in my drawer.. but they expired in 04/07! LOL. Do you reckon they'd work??

I'm not necessarily relying on it.. i can usually tell when I'm O'ing, but I had such a random long cycle last month (58 days) that I figured I could use the OPK in my drawer this time, but yeah.. they're really old.

Should I just use em up?