They could possibly learn that from an appropriate card that accompanies the present but is not read publicly.
(‏ غلاطية ٥ :‏ ٢٦ ؛‏ ٦ :‏ ١٠‏ )‏ لَا شَكَّ أَنَّهُ لَيْسَ مِنَ ٱلْخَطَإِ أَنْ يَعْرِفَ ٱلْعَرُوسَانِ مَنْ قَدَّمَ لَهُمَا ٱلْهَدِيَّةَ .‏