Extract unique numbers

Please try M2 copy down

=IFERROR(AGGREGATE(15,6,$A$1:$J$5/NOT(COUNTIF($E$10:$E$32,$A$1:$J$5)+($A$1:$J$5="")),ROWS(M$2:M2)),"")

Using helper columns.
2d matrix to column 'M':

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Test if missing from random list:

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List of missing numbers (array entered** in column O):

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**...confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer.