what i have noticed that boxes from different areas as c/w or t/w that are intended to be used in pure will change its bk but not ird. coz i've had a box from c/w and go the key but after connecting to the stream it changed the bk so may be worth selling on.lol
No, a box will never change its boxkey unless you physically re-flash it with the dump from another box. The boxkey is stored in a protected flash sector which is never tampered with by the cc's. To all intents and purposes you could consider the IRD/Boxkey & MAC data (plus some other stuff) as being stored in ROM and being totally unchangeable.