The ones you posted aren't worth grading. The 1956 Adventure cards are abundantly available in really nice shape because of some vending finds about 20 years ago, and rarely hit big money unless they are really high grade, which yours are not because of the centering, which is the limiting factor with them in general. You will likely get a 6 on the Robinson, which translates to not worth the cost of slabbing.
As for values, it really depends on the item. Rare stuff can fly; common stuff will drag. FWIW, Sterling usually has boxing in its monthly auctions and Love of the Game has 23 lots in its current auction.
Got any questions, post them in the boxing forum. And please check out my site.
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