Firstly, thank you kind sirs for posting the link to the autographed buy it now set at $699, which with its free shipping comes to about the same price as the non-autographed set sold recently.

I have been monitoring the prices of the chips for some time now, and over the past year, a number of non-autographed sets have sold for between $400 and $675, with an average of $570.

I have seen 3 autographed sets, one of which had a questionable signature and fetched only $500. The other 2 reached in excess of $800.

I think Toms empty case is therefore worth about $150 - $200.