I actually don’t see either exact conditional tag anywhere.
This is the index.php
<?php get_header() ?>
<div id="container">
<?php get_sidebar() ?>
<div id="content">
<?php while ( have_posts() ) : the_post() ?>
<div id="post-<?php the_ID() ?>" <?php if (function_exists(post_class)) { post_class(); } else { sandbox_post_class(); } ?>>
<h2 class="entry-title"><a href="<?php the_permalink() ?>" title="<?php printf(__('Permalink to %s', 'sandbox'), wp_specialchars(get_the_title(), 1)) ?>" rel="bookmark"><?php the_title() ?></a></h2>
<div class="top-meta">
<small class="metadata">
<span class="comments-link"><?php comments_popup_link('0', '1', '%', 'commentslink', 'Closed'); ?></span>
<span class="meta-sep">|</span>
<span class="chronodata"><?php the_time('F jS, Y') ?></span>
<span class="meta-sep">|</span>
<span class="cat-links"><?php printf(__('Posted in %s', 'sandbox'), get_the_category_list(', ')) ?></span>
<?php edit_post_link(__('Edit', 'sandbox'), "\t\t\t\t\t<span class=\"meta-sep\">|</span><span class=\"edit-link\">", "</span>\n"); ?>
</small>
</div>
<div class="entry-content">
<?php the_content(''.__('Read More <span class="meta-nav">»</span>', 'sandbox').''); ?>
<?php wp_link_pages('before=<div class="page-link">' .__('Pages:', 'sandbox') . '&after=</div>') ?>
<span class="clear"></span>
</div>
<div class="bottom-meta">
<small class="metadata"><?php the_tags(__('<span class="tag-links">Tagged in: ', 'sandbox'), ", ", "</span>\n") ?></small>
</div>
</div><!-- .post -->
<?php comments_template() ?>
<?php endwhile ?>
<div id="nav-below" class="navigation">
<div class="nav-previous"><?php next_posts_link(__('<span class="meta-nav">«</span> Older posts', 'sandbox')) ?></div>
<div class="nav-next"><?php previous_posts_link(__('Newer posts <span class="meta-nav">»</span>', 'sandbox')) ?></div>
<span class="clear" />
</div>
</div><!-- #content -->
</div><!-- #container -->
<?php get_footer() ?>
and this is the page.php
<?php get_header() ?>
<div id="container">
<?php include ('sidebar2.php'); ?>
<div id="content">
<?php the_post() ?>
<div id="post-<?php the_ID(); ?>" <?php if (function_exists(post_class)) { post_class(); } else { sandbox_post_class(); } ?>>
<h1 class="entry-title"><?php the_title(); ?><?php edit_post_link(__('Edit', 'sandbox'),'<span class="edit-page-link">','</span>') ?></h1>
<div class="entry-content">
<?php the_content() ?>
<?php wp_link_pages("\t\t\t\t\t<div class='page-link'>".__('Pages: ', 'sandbox'), "</div>\n", 'number'); ?>
</div>
</div><!-- .post -->
</div><!-- #content -->
</div><!-- #container -->
<?php get_footer() ?>