$4,850 for 62 keyboards?
Were they gold plated?
That breaks down into about 76 USD per keyboard, which if you look at a popular retailer like NewEgg is on the upper end of offerings but still sell.
I would imagine however that the cost not only includes the price to replace the keyboards but also the IT labour involved to have a look at the problem and I would imagine in the case for something like Dvorak-style keyboards the time costs involved with re-configuring the machines affected.