Не добивается try_files

[J Channel]

Почему-то не работает такая конструкция:

       location ~ ^/book/(vc/xml/spo_xml|xml\.jsp) {
             if ( $arg_spo ~ "^[\d]+([\d]{2})([\d])$" ) {
                set $ff $1;
                set $ss $2;
             }
             try_files /opt/xmlgate/cache/$ss/$ff/$arg_spo @tom;
        }
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