"Hi, Costco. We would like to subpoena you for the customer records for every person that bought gold. Note that 'would like to' means 'are going to, and you will comply'. Love, the US Government."
"lost it"
"Mind if we search your house?"
"i've known you were going to ever since I bought the gold; knock yourself out. Just please don't disturb my antique collection of locked filing cabinets. They're all empty but the keys are in that big pile over there"