There is always an element of risk when you order goods online.  Unless you’re very familiar with the store you’re ordering from, there is sometimes the feeling that perhaps you should be able to check their authenticity.  I’ve had exactly this problem.  A problem arose with the USB charger cable for my mobile phone.  I’ve got two of the fantastic fast chargers – brilliant, but the cables themselves have flimsy connection and of course, after many pluggings in and yanking outs, over time, the plastic protective coating wears out and I note a few bare wires visible.    I ordered what was described as genuine maker, C type cable – listed my phone exactly.  Great, it came next day – but it was obvious from the first use this was not a genuinely compatible item – the connection into the phone does not engage satisfactorily and keeps slipping out so the phone then alerts me to it’s failure to fast charge, or charge at all.  This has happened three times from 3 different suppliers, so I’ve now had to buy a complete charger and cable at ten times the price, just to get a reliably genuine cable.  A tad disappointing but at least the online business allowed me to find what I needed!