Play the odds. There is no guarantee that you have the right variety but in package is a good start for the right variety. Sell it as possible and let the buyer take the risk. About ten years ago a seller put up an unopened package of cigarettes. What's so good about those? Nothing much except that this brand is the one that provided the million dollar Honus Wagner recalled cards. The odd were worse than 1 in 200 that it might be a Honus Wagner but the pack sold for more than $400,000 if I am correct in my memory. I also remember that when the pack was opened by the grading service it contained a several hundred dollar card in that condition. You also see unopened packs of 1952 Topps sold to people who want a $75,000 Mickey Mantle rookie card. They take an unopened box and sell each pack. Some boxes have one or more key cards others don't have any. Sell the sizzle not the steak. Let someone else pay through the nose to have THAT THRILL.
And there are folks, who buy the contents of storage lockers, and get nothing but dirty laundry and old car parts.......
the Cheerio Sac Dollars were mishandled during breakfast and now have Milk Spots and Spooning marks ...
You bought a cereal and got $1.01 in cashback?? Nice. Here's one graded example: https://www.ebay.com/itm/202101109741