Agree with Scott. The exception would be a blank back proof card, but unless it is a different front from the issued card or labeled from Topps vault it is usually impossible to differentiate a proof card from a blank back error.
But there are a lot of ardent master 75 Mini collectors who might be interested. There is a long thread in the Registry forum on CU with a lot of 75 Mini followers. You might post about it there too
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