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I would like to get some feedback on whether or not it is worth cracking these Ikes out of their black rectangular plastic cell.
What type of significantly valuable varieties for these particular enclosures only would warrant a crack-out?
Based upon experience and past results what would be the probability of uncovering an MS69 or MS70 from one of these cases?
With this many I would leave them in their cases until I decided to make sets with them. The packaging, at least in my opinion, doesn't add any value. They are what they are. The probability of uncovering an MS69 or MS70 is impossible. These are PROOF coins, so they would grade as PR67, 68, 69, etc.

There may very well be some PR69DCAM Ikes in that lot. This is the most you can really hope for. PR70DCAM Ikes are rare, but you never know.
As far as varieties go, the 1971-S
DDO Ike attributed as FS-103 and the 1971-S
DDR attributed as FS-801 are TOUGH, and you would need members of the
Ike Group to attribute them properly. You simply cannot trust the
TPG to do it correctly. They have incorrectly attributed more of the FS-103 than anything else. I had an FS-106
DDO that was misattributed as an FS-103, but at least they corrected it.
But those varieties are nowhere near as cool as the 1971-S Nightcrawler. This is a hubbed-through reverse, single-die variety, of which less than 20 are currently known. I'm the lucky owner of one of these. It was created when a linear shard of die metal slid off the eagle's left leg and embedded near the talon, giving the appearance that the eagle is clutching a worm ("nightcrawler"). Here is a close-up image of my nightcrawler so you can see what I'm talking about. Follow the red arrow . . . .

So, if I were you I would look at every 1971-S in that lot to see if any of them contain the nightcrawler. You don't even need a loupe to see it, as long as your eyesight is OK.

Please let us know the results!