No creditcard merchant can stop someone using a bogus card, or someone saying it wasn't delivered, wasn't them that ordered you etc etc....it happens whatever system you use so be careful when taking creditcard jobs.
Did they ring on a mobile?
Is the pick up address from a high value biz such as from the Plumbing, Building or Metal industry?
Have they arranged to meet you in a carpark or garages near to the delivery address?
When you get a card authorised it DOES NOT mean its not a scam
You can get it taken back several months later, so be warned
A guy sold a load of HiFi equipment to a bogus creditcard user...I warned him but not before he'd lost 3 1/2 K, a metal company sold 10k of copper to a bogus creditcard user...it happens all the time, unless you know what to look for