UKGuy,
Christmas seems intrinsic to the entire affair. I do not view the timing as coincidental or parallel. Kolar's significant inclusion in FF of the CS photo of the presents with torn wrappings implies something that he cannot state directly. Also, the size 12 Bloomies were purchased by PR as a Christmas gift. I have mentioned before that, in the novel, Lolita dies on Christmas. "If you want her to see 1997" refers to the upcoming New Year's Day. The Holidays are a stressful period for many.
The RN says that the Rs will receive a call from the kidnappers "between 8 and 10 am tomorrow". As has been noted, if the parents are awaiting this call on the 26th, it implies that the RN was written on Christmas, i.e. before midnight. 'Tomorrow' remains ambiguous, since it could also refer to the 27th. If the 27th were actually meant, then the odd suggestion made to supposedly sleeping people "to get a good rest" makes better sense?
Does any one know what PR gave JR for Christmas?