They gave you a new punchcard...... There's no way to tell how many fish you punched on the last card, other than your guestamation. Just go pull some fish and don't worry too much about how many fish were punched on your last card. If you've got some sort of moral conflict going on about how many fish you're taking, then stop at your seven fish or whatever. If not, then fill the damn card up.
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If you get home and I'm not there, don't eat it.