There's plenty of ways to find out if a webshop is reputable. This one in particular mostly sold games and had tons of good reviews on a Dutch gamer site.
It's more than reputation, though. I bought Office 95 for -- forgive me if I'm off on actual numbers here; it's been a long time -- $200, when the going price was $400. I wanted to be legit, and this was supposedly the "OEM" price. The jewel case had the inserts with the holograms and the CD's had the etching, and everything looked genuine. The key worked just fine. They even shipped it with a CD audio cable, as was the custom to "legitimize" "OEM" sales. Everything about the purchase seemed legal and legitimate.
Right after that, my Fortune 250 bought a Select Agreement, and a sales rep came in to explain it and answer questions. I asked why the best price the company could buy Office 95 for was $400, when I could buy it online for half of that, and she explained that it was illegitimate. She explained that it HAD to be. Microsoft simply did not sell that software any cheaper than an A-level Select Agreement (or whatever it was).
I didn't have someone's copy of a CD with a hand-scrawled black marker label. I had an actually-stolen physical product. I realized I couldn't trust anyone online, really. Selling it for half price, with the cable, instead of, say $20, was the key to making it look legitimate.
It was the last of a lot of straws. After this, I made Linux my desktop OS, and ran it for 19 years, till I switched to Mac a few years ago.
