Altough the fault that some keycaps were wrong was very minor, I asked the PCspecialist for the correct keycap. It arrived in a few days, and so the keyboard, and the whole laptop, is now without any fault.
This is more or less a review after about a month of use. Just for completeness, I remark that the service was as good as expected. The laptop was sent and arrived around the predicted time and was packed so well that there was no possibility of it being damaged.
As for the laptop itself, so...