contains the contents of a JPEG image file.
I suppose one approach to try and narrow it down would be divide and conquer the contents of $file{'receipt', 'file'}. Split it in half and check both halves. Split the bad half again, etc.
You said you tried printing the contents to a file. I assume that was successful?
EDIT: Or instead of divide and conquer maybe try something like:
my $len = length $str;
for(my $i = 1; $i <= $len; $i++) {
print substr($str, 0, $i)
}
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