$ man affcat
...
Missing pages will not be padded, but the fact that they are missing will be noted on STDERR.
...
Users might assume that there are no missing pages if nothing is output to stderr. This is not the case unless -n is specified because -q is the default.
Users might assume that there are no missing pages if nothing is output to stderr. This is not the case unless
-n
is specified because-q
is the default.