I have 6 unopened and 1 opened Ektachrome 64 4x5 10sh boxes. I have had them frozen since i took possession of them, probably around 1989. they have an expiry date of 1982. the opened box is missing a few sheets from when i tested it probably 10 years ago. From what i remember the result was what i would expect a bit of speed loss and a quite a bit on the cool side color-wise. I can post a picture of the boxes if anyone is interested. Best offer, obviously sold - AS IS. if you're close enough to nyc for pickup - even better.