Converting htaccess rules to Nginx

Hi, i need to convert bellow htaccess rule for my nginx server. i have tried to convert and bellow is my result. unfortunately its not working. can somebody tell me where i have done wrong?

Original htaccess rule

RewriteRule ^file/(.*) /wp-content/uploads/$1?sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^ext/(.*) /wp-content/plugins/$1?sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^skin/([_0-9a-zA-Z-]+)/main.css /index.php?style_wrapper=true&template_wrapper=$1&sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^skin/([_0-9a-zA-Z-]+)/style\.css /nothing_404_404?sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^skin/(.*) /wp-content/themes/$1?sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^([_0-9a-zA-Z-]+/)?ajax /wp-admin/admin-ajax.php?sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^inc/(.*) /wp-content/$1?sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^(readme\.html|license\.txt|wp-content/debug\.log|wp-includes/$) /nothing_404_404?sEyM_hide_my_wp=1234 [QSA,L]
RewriteRule ^(((wp-content|wp-includes)/([A-Za-z0-9\-\_\/]*))|(wp-admin/(!network\/?)([A-Za-z0-9\-\_\/]+)))(\.txt|/)$ /nothing_404_404?sEyM_hide_my_wp=1234 [QSA,L]``` 


Converted Nginx rule

location /other { rewrite ^/other/(.*) /wp-includes/$1?sEyM_hide_my_wp=1234 break; }

location /file { 
rewrite ^/file/(.*) /wp-content/uploads/$1?sEyM_hide_my_wp=1234 break; }

location /ext { 
rewrite ^/ext/(.*) /wp-content/plugins/$1?sEyM_hide_my_wp=1234 break; }

location /skin { 
rewrite ^/skin/([_0-9a-zA-Z-]+)/main.css /index.php?style_wrapper=true&template_wrapper=$1&sEyM_hide_my_wp=1234 break; 
rewrite ^/skin/([_0-9a-zA-Z-]+)/style\.css /nothing_404_404?sEyM_hide_my_wp=1234 break; 
rewrite ^/skin/(.*) /wp-content/themes/$1?sEyM_hide_my_wp=1234 break; } 

location /inc { 
rewrite ^/inc/(.*) /wp-content/$1?sEyM_hide_my_wp=1234 break; }

location / {
	try_files $uri $uri/ /index.php$is_args$args;
	# try_files $uri $uri/ /index.html;
	# try_files $uri $uri/ =404;
	rewrite ^/([_0-9a-zA-Z-]+/)?ajax /wp-admin/admin-ajax.php?sEyM_hide_my_wp=1234 break;
	rewrite ^/(readme\.html|license\.txt|wp-content/debug\.log|wp-includes/$) /nothing_404_404?sEyM_hide_my_wp=1234 break;
	rewrite ^/(((wp-content|wp-includes)/([A-Za-z0-9\-\_\/]*))|(wp-admin/(!network\/?)([A-Za-z0-9\-\_\/]+)))(\.txt|/)$ /nothing_404_404?sEyM_hide_my_wp=1234 break;
}

thanks in advance.