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