From my research:
U.S. thins Gitmo camps; 16 Saudis released, September 6, 2007
.....
Agence France Presse, the French news agency, reported from Riyadh that the transfer brought to 93 the number of Saudi detainees handed over to the kingdom in a series of repatriation missions negotiated between Washington and the oil-rich Persian Gulf kingdom.
Another 37 Saudis are still held in the prison camps in Cuba, AFP said.
Now, subtracting these next 10 as reported by this
BBC article,
there should be 27 Saudis remaining. But 27 is not the number given...
BBC's number is "around a dozen" Saudis remaining.
29 December 2007
Ten Guantanamo Bay detainees have been freed and returned home to Saudi Arabia, US and Saudi officials say.
.....
Around 275 people remain at the detention centre in Cuba and the Pentagon says another 60 inmates are now eligible for transfer or release.
The US has returned dozens of Saudi former detainees over the past year.
Around a dozen Saudi nationals are estimated to remain at the US facility.
Their detention has been a source of strain between Washington and the government in Riyadh, a close US ally.
27 vs "around a dozen"...
Why this ~15-detainee discrepancy?