Thanks for using <code> tags. However, these should only be around the actual CODE posted. Your text comments should be outside the tags.

Regarding the DisplayAlerts attribute, I suggest you set it this way:

my $FALSE         = 0;
my $TRUE          = ! $FALSE;

$Excel->{DisplayAlerts} =  $FALSE;
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Alternatively, you could use the Readonly module for the constants, or use literal values 0 and 1.