It wouldn't be a proof set if it was struck at the Denver mint (all proof sets 1968-present have been struck at the San Fransico Mint) and so it would instead be a partial mint set. I'd say it would be worth about $3-4 if it was sealed.
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Current retail value is $10.00 issue price was $7.00
100.000.000
With original Mint packaging retail is $30.00 for a Silver Proof Set
9 BILLION (Excluding "Proof" coins) 4.6 are from the Philadelphia Mint. 4.4 are from the Denver Mint.
13.1 BILLION (Excluding "Proof" coins) 6.6 BILLION are from the Philadelphia Mint. 6.5 are from the Denver Mint.