The gift checkbox is for people that don't know the account number. 2024 Schedule M Instructions - Illinois Department of Revenue states:
Check the box in Column C if your contribution was a gift. Attach: If you do not have the account number for a gift contribution, attach the following:
■ Copy of the cancelled check used to make the contribution, and
■ Account holder’s name and address Enter the lesser amount of Line 13a or $10,000 ($20,000 if married filing a joint return) on Line 13.
Note: Line 13 may not exceed $10,000 ($20,000 if married filing a joint return).
However, in order to e-file, you will want to add the account numbers to add up to your amount paid or the maximum allowed. You would not need to mark gift.
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