Given the current state of things, they may not have anybody on site full time that is charged with handling direct over the counter sales. Those guys you saw may very well be responsible for pulling parts from shelves, packaging things for shipment, or sweeping the floors. Several commercial warehouse places around Detroit ask the same thing - place you order with your phone via a call or electronically - and they will have a guy walk the parts out to your car. No sales or order entry, card reader, cash register, or even a counter required since many cannot even get workers right now. Not what we all want - but sometimes having the item is more important.