The Amex concierge team has been able to find me items at local stores when I needed things ASAP that I was having trouble finding, and also managed to snag me a limited release item that was only available at the companies' location. (That was expensive, but still less than I saw them for being resold for online. I imagine a courier service could have been used if I was familiar with any in the area, since it was basically a 'drive there, pick up, drive to UPS store, ship' type request)
I asked them to go through the craigslist of another city and find a certain car for sale, then return a list sorted by mileage and price. They couldn't do that for whatever reason and just offered to give me the KBB value.
Took me 5+ minutes to navigate their phone menu, enter my card number and get to the service.