The only way Aspless's solution would work (that I can see) is if the user were to use some sort of on page navigation (a button or link) that would link back to the first form. If the user hits the 'Back' button in the browser there is no way for you to control what is passed in the query string. Furthermore, hitting the back button in your browser pulls the pages from the browser cache thus the page isn't actually reloaded.
What might resolve your problem is to set some sort of Session variable with the value you are interested in and set the first form page to not cache; this would mean every time someone goes to that page it would have to be served up from the Web Server and not pulled from the browser cache. You would merely need to check for the existence of this session value and, if it is present, populate the box otherwise leave it alone.
Wrox online library: Wrox Books 24 x 7
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