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davidcyclebackI would imagine there's a distinct difference between new and 37 year old Milk Duds.
The full boxes get a premium. I don't think whether or not the full box contains the candies has much effect on the value. I ate numerous Milk Duds in movie theaters as a kid, and I recall the candies being loose in the box.
To forensically date the contents, offer one of the Milk Duds to your dog. If the dog turns it down, it's 37 years old. I have two dogs who try to forensically date my food all the time, except for the salad and sauerkraut.