I have 700 Sheets of undated AZO 8X10 and it sure seems fine, but I never used AZO before a few years ago
I found it above a Detroit bar in winter with broken windows, laying on floor. One box sealed
I also have NOS ASO 2-1/4 X 3-1/4 box of 100 that looks far older, bought it on eBay last year for peanuts
I am rationing it all for my old age
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