Linux – vsftpd server allow anonymous to upload files and nothing else

Trying to let anonymous users login and upload files to a directory "/srv/ftp/dropbox" but not see or download anything.

Can login as anonymous but when I try and upload a file with the following command I get these error's.

put /home/username/TestFTP /srv/ftp/dropbox/TestFTP  
229 Entering Extended Passive Mode (|||30094|).  
553 Could not create file.   

The "/etc/vsftpd.conf" file has this in it, If its not on list its commented out most likely.

write_enable=YES  
dirmessage_enable=YES  
nopriv_user=ftpsecure  
local_enable=YES  
chroot_local_user=YES  
chroot_list_enable=NO  
allow_writeable_chroot=YES  
anonymous_enable=YES  
anon_world_readable_only=YES  
anon_upload_enable=YES  
chown_uploads=YES  
chown_username=username  
anon_root=/srv/ftp/dropbox  
syslog_enable=YES  
log_ftp_protocol=YES  
xferlog_enable=YES  
vsftpd_log_file=/var/log/vsftpd.log  
connect_from_port_20=YES  
ssl_enable=NO  
userllist_deny=NO  
userlist_enable=YES  
userlist_file=/etc/vsftpd.allow_users  

Permissions on the directories are

srv = drwxr-xr-x  
ftp = drwxr-xr-x  
dropbox = drwx-wx---  

Ownership of the 3 folders is set to root right now

The OS i am running is openSUSE 12.2 for more information.