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.