If you're gonna soak them... For EACH card that has an autograph, get a Q-tip and some bits of paper towel. Then get the tiniest bit of dampness on the Q-tip and touch that to that part of the autograph that you could tolerate failure. Failure will be that the autograph ink is water soluble, and the ink will run, ruining the autograph and diminishing the value of the card. If it starts to run, blot blot blot with the paper towel bits. If the ink is oil based it shouldn't run, and that is an initial step in whether to soak. If later on you soak with hot hot water then the oil base ink is more likely to run... (so I'd not get hot water going).
I've not soaked a Batter Up. I think they're layered cards, and they'll separate if soaked for very long. I think I have soaked a few premiums. Just out of cautiousness, if you're all motivated to soak one, start with soaking the one you value least (that's not necessarily the one with the least monetary value).
If you do soak, be ready to blot dry with tea towels or paper towels, the let air dry a bit, then put the card between cardstock or blotting paper and stack up some books to sandwich your card so it'll dry flat.
I'd look for a piece of the paper with something other than a ball card glued to it, and try soaking that, first. If the glue isn't water soluble then soaking isn't going to help you much.
Get your stuff together before you soak, so you're ready for contingencies. Be patient. Good luck with it. If you soak any of the cards, then you should know that some folks consider that card altering and wrong.
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