As far as I can tell there's been no modifications done as there's no option to remove your changes. Below is the code from address.php from Hikashop>Display>Views:
<?php
/**
* @package HikaShop for Joomla!
* @version 2.0.0
* @author hikashop.com
* @copyright (C) 2010-2012 HIKARI SOFTWARE. All rights reserved.
* @license GNU/GPLv3
www.gnu.org/licenses/gpl-3.0.html
*/
defined('_JEXEC') or die('Restricted access');
?><?php
if($this->identified){
$mainId = 'hikashop_checkout_address_billing_only';
$leftId = 'hikashop_checkout_billing_address';
$mainClass = 'hikashop_checkout_address_billing_only';
$leftClass = 'hikashop_checkout_billing_address';
if($this->has_shipping) {
$mainId = 'hikashop_checkout_address';
$leftId = 'hikashop_checkout_address_left_part';
$mainClass = 'hikashop_checkout_address';
$leftClass = 'hikashop_checkout_address_left_part';
}
if(HIKASHOP_J30) {
$mainClass .= ' row-fluid';
$leftClass .= ' span6';
}
?>
<div id="<?php echo $mainId; ?>" class="<?php echo $mainClass; ?>">
<div id="<?php echo $leftId; ?>" class="<?php echo $leftClass; ?>">
<fieldset>
<legend><?php echo JText::_('HIKASHOP_BILLING_ADDRESS');?></legend>
<?php
$this->type = 'billing';
echo $this->loadTemplate('view');
if($this->has_shipping) {
?>
</fieldset>
</div>
<div id="hikashop_checkout_address_right_part" class="hikashop_checkout_address_right_part<?php if(HIKASHOP_J30){ echo ' span6';} ?>">
<fieldset>
<legend><?php echo JText::_('HIKASHOP_SHIPPING_ADDRESS');?></legend>
<?php
$checked = '';
$style = '';
$override = false;
if(!empty($this->currentShipping) && method_exists($this->currentShipping, 'getShippingAddress')) {
$override = $this->currentShipping->getShippingAddress();
}
if($override === false) {
$onclick = 'return hikashopSameAddress(this.checked);';
if($this->shipping_address==$this->billing_address){
$checked = 'checked="checked" ';
$style = ' style="display:none"';
$nb_addresses = count(@$this->addresses);
if($nb_addresses==1){
$address = reset($this->addresses);
$onclick='if(!this.checked) { hikashopEditAddress(document.getElementById(\'hikashop_checkout_shipping_address_edit_'.$address->address_id.'\'),1,false); } '.$onclick;
}
}
?>
<label for="same_address">
<input class="hikashop_checkout_shipping_same_address inputbox" <?php echo $checked; ?>type="checkbox" id="same_address" name="same_address" value="yes" alt="Same address" onclick="<?php echo $onclick; ?>" />
<?php echo JText::_('SAME_AS_BILLING');?>
</label>
<div class="hikashop_checkout_shipping_div" id="hikashop_checkout_shipping_div" <?php echo $style;?>>
<?php
$this->type = 'shipping';
echo $this->loadTemplate('view');
?>
</div>
<?php
} else {
?> <span class="hikashop_checkout_billing_address_info"><?php echo $override;?></span>
<?php }
}
?>
</fieldset>
</div>
</div>
<div style="clear:both"></div>
<?php
}else{
}