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You don't need to use the word "sandbox" but there may be a delay in indexing the redirected content based on how often your original site gets crawled. (The redirects that went into effect when seomoz changed to moz, for example seemed to happen right away, for example. others might take a month or more. In your case, it sounds like you're moving from one domain to another?  If that's the case, then the redirect should be reflected in Google's search results as soon as the original domain is recrawled.

Hi Scott, What you're suggesting - somehow assigning each blog post to a specific location - doesn't make sense to me for taxonomy purposes or for SEO purposes. Assuming you assigned the posts to a specific taxonomy for locations, whether that looked like Tags or Categories, it provides little value aside from adding a small amount of text to the page. Internal linking is one way to take advantage of the fact that you have that much unique content, but that really boils down to 2 tasks: Ensure that each of the 4 locations has a dedicated location page (eg domain.com/locations/seattle-wa/) that is linked from your nav menu or sidebar in order to make sure every page on the site links there. Be mindful of the anchor text you use - it's hard to do an anchor text heavy with keywords for a location page without it looking spammy). Add links within the body content of the page - when it's relevant to do so. You can also begin to produce blog content that is geographically relevant as a way to directly build links to these location pages. For example, if your 4 locations were paint supply stores, and one location was in Seattle, you might create an article on "18 Seattle Homes With Crazy Paint Jobs" - this would be an effective piece of content to link directly to your Seattle location page. You'd want to do it in a natural way. Here's a good vs bad example: Good: "We sent out 2 paint consultants from our Seattle location to scout out the most off-the-wall paint jobs in the Emerald City." Bad: "Read more about our Seattle paint store."

I like this strategy. As you add new better content, you can add nice links from the old bad content. You can have a constant source of links from relevant sites. Sweet!