It's sensible to think that they are the normal ins, del, etc moved to that position. Otherwise, if they shared the codes with the numpad, when the numpad status is on, they would register numbers.
Actually, in my current keyboard I don't use printscreen, scrolllock nor pause. I have then remaped to: launch Firefox, launch / restore / minimize foobar2000 and pause / play music. The screen capture function is with shift + printscreen in my case. If I purchased the FC900M I think I'll keep on with these hotkeys and I'll think of another one for the remaining key. What I don't want is to have not matching legends on those keycaps. I suppose I could replace them with a bunch of blank keycaps or something like that. I'd like to know where to buy just a buch of keys, not a full set.
In case you are interested, other hotkeys I use in my keyboard are:
f12: close all opened explorer windows
hold f12: shutdown computer killing all opened tasks
hold f7: extract pendrive
hold f8 extract portable hard disk
ctrl atl u: write my web server url
ctrl alt b: change between normal and reduced brightness
ctrl alt f1: launch Mediatools (an independent script that I use a lot, which has lots of other hotkeys)
ctrl alt t: add the url of the current Firefox tab to a cumulative txt file
ctrl alt shift t: add the urls of all opened Firefox tabs to a cumulative txt file
ctrl alt p: print in Word in draft black and white mode
alt 1, alt 2 and alt 3: to open predefined folders
alt shift 1, 2 and 3: to define folders
I have also some hotkeys assinged to my extra mouse buttons, such as open selected file with Ultraedit or open selected textual url in Firefox...