Vlim,
The box looks like it was made for the WTP. So I am guessing you found a vintage box and fitted the inside to accommodate the WTP? I have done this too for a few of my examples. I have also seen it done by other collectors. It makes for a very attractive presentation.
Since the box does not have room for the holster, if you send it to me I will be happy to store it for you. (intended as humor)
Regards,