My 69 had the rear glass when I bought it. The center folding seal was bad so when i replaced the top I put in a plastic one. the glass has been in my garage for a couple of years. Is it worth anything
TIA

Doubt it's worth anything. It's not an original part. All 67 to 69 convertibles came with plastic rear windows originally, none had glass ones. Mustangs had folding glass, and you can get rear window curtains with glass from JC Whitney.

Maybe some creative marketing on Ebay would bring big dollars though. "Prototype Camaro Convertible Rear Glass" Believed to have been removed from Pete Estes' original 68 Z28 convertible.