If you want to test all 256 codes, pasting them into PE would get very tedious. It is much easier to use either hex2ccf or irpanels to convert the whole set of 256 codes into a ccf file, then merge that ccf into a copy of your own ccf for testing.

I wouldn't guess a freeview box would have any functions that aren't on the original remote. But you can't be sure unless you try them.

I'm not sure Boxbrownie understands a key point underlying what Makitamark has said: If you know how to use certain programs (IrTool and MakeHex for example) you can take one learned signal from the original remote and from it generate 256 different signals that almost always include every function understood by the device, even those that were not on the original remote. So if there are and discrete codes, those should be discovered if you test those 256 signals that I assume were emailed.