The blue & white packaging was from the 70's & 80's when parts were still available from the local Chevrolet dealer. Sometimes they were even in stock.
I know because I bought a bunch of parts then. Some of these parts I still have. The wiring parts I have are still nice & pliable as is the backup light harness I have that is in the brown (cardboard), green & orange box from the 50' & 60's. I would say that if the paper is still that much intact that the wiring is most likely still good.
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