That sounds like a marginally legitimate form of the old white van speaker scam.
A guy in a parking lot approaches you, offering some hi-fi equipment under a ruse like "the warehouse ordered too many" or "it was left over after an installation job". They show you brochures or fake invoices with high list prices. The equipment is of course cheap garbage, worth far less than the supposedly discounted price.
A guy in a parking lot approaches you, offering some hi-fi equipment under a ruse like "the warehouse ordered too many" or "it was left over after an installation job". They show you brochures or fake invoices with high list prices. The equipment is of course cheap garbage, worth far less than the supposedly discounted price.
https://en.wikipedia.org/wiki/White_van_speaker_scam