There was a discussion about this on the Let's Eat thread.
Latest update was that nuts were catered already in ramekins for BusinessFirst. No loose nuts in bin to accommodate requests for refills.
If someone turned down theirs, it MAY be used to fulfill requests for seconds, or possibly set out for mid-flight "snacks".
They do seem to supply GlobalFirst with extras, so perhaps some are being poached from here as well?
Anyway, not like the days of old when they would wander down the aisle with the big pan and silver ladle, offering up seconds to everyone....