these are the lines that count the total items listed:

opendir THEDIR, "$config{'basepath'}$key" or &oops("Category directory $key could not be opened.");
readdir THEDIR;
readdir THEDIR;
$totalfiles = scalar @{[readdir THEDIR]};
$totalfiles2 = $totalfiles2 + $totalfiles;
closedir THEDIR;

These are the lines that display the total items and total users

######## Auction Statistics ##################
print "<p>";
print "<TABLE BORDER=\"0\" CELLSPACING=\"0\" CELLPADDING=\"0\" WIDTH=\"100%\">";
print "<TR><TD ALIGN=\"CENTER\" BGCOLOR=\"$config{'colortablehead'}\"><b>Auction Statistics</b></TD></TR>";

print "<TR><TD BGCOLOR=\"$config{'colortablebody'}\">Current Auctions Listed</b><font Color=\"red\"> ($totalfiles2)</FONT></TD></TR>";

print "<TR><TD BGCOLOR=\"$config{'colortablebody'}\">Total Registered Users</b><font Color=\"red\"> ($numusers)</FONT></TD></TR>";

print "</TABLE>";