Are you sure what the casino representative meant was a receipt from a coffee shop? Or what he meant was a utility bill receipt to prove that you actually reside in the geographical location you filled while verifying your account details?. Because asking for Utility bill is a common criterias which are always been needed for account verifications, as it involves recurring charges for home maintenance such as Electricity bill, Water bill, Gas bill, Internet bill, Phone bill, Cable TV Subscription bill and Waste Management Bill. And as such, any of these documents can be used in verifying your account as utility bill, inasmuch as it's still not more than 2 or 3 months old. As some casinos can specify that the utility bill should not be more than 2 months old.