you should be able to view the default version of the template in /resources/sql/install/tblemailtemplates.data.sql - but i've pasted the content for it from v7.8.3 below...
<p align="center"><strong>PLEASE READ THIS EMAIL IN FULL AND PRINT IT FOR YOUR RECORDS</strong></p>
<p>Dear {$client_name},</p>
<p>Thank you for your order from us! Your shoutcast account has now been setup and this email contains all the information you will need in order to begin using your account.</p>
<p><strong>New Account Information</strong></p>
<p>Domain: {$service_domain}<br />Username: {$service_username}<br />Password: {$service_password}</p>
<p><strong>Server Information</strong></p>
<p>Server Name: {$service_server_name}<br />Server IP: {$service_server_ip}<br />Nameserver 1: {$service_ns1}<br />Nameserver 1 IP: {$service_ns1_ip}<br />Nameserver 2: {$service_ns2} <br />Nameserver 2 IP: {$service_ns2_ip}</p>
<p>Thank you for choosing us.</p>
<p>{$signature}</p>
if it's completely missing, you should just need to create a new product email template, called it SHOUTcast Welcome Email and paste the code info it... if it already exists, just paste the code in using the source info box on the template editing page.