MtGox, the Bitcoin exchange that used to be the World’s largest, still publishes no valid address on their homepage. See my post one month ago on that problem.
I just searched on the FinCen website and found that MtGox actually has registered with FinCen in June of this year. The address given is “615 S Dupont Hwy Dover, DE”, which is an address that actually exists (in contrast to the address MtGox displays right now at their website). Here is a link to Google Maps for that address.
Google Street View shows this:
Again, this does not impress me as a place you would expect a business like MtGox to be located. I may be wrong, since I have no opportunity to look at that address close up from the ground. But it does seem to be rather strange.
As FinCen comments when displaying this information:
Information contained on this site has been provided by the MSB registrant. FinCEN does not verify information submitted by the MSB.