Default address used for walk-up constituent accounts

We are finding that the it's difficult to get accurate sales analysis by zip code because of the high number of constituent records that have the same zip code as our business address.  It has been our default to use the city, state, and zip from our business address for night-of-show walk-up sales or any transaction where we can not get an address or the customer refuses to give the address.  The result  of this is that it appears sales in that zip code are off the charts.  We can't eliminate this zip code from analysis because it actually does include the majority of our customer base. 

I'm curious to know what other organizations use as the "default address" when a real address can not be entered?  What do you enter for the street information?  Is it the policy to automatically mark these undeliverable or mark it in such a way to encourage getting an accurate address in the future? 

Thank you in advance for the feedback!

Chuck Buchanan

92nd Street Y

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