A series of tweets from the Houston Chronicle's @Jonathan_Feigen:
Rockets so far unable to hand deliver Lin offer sheet. Knicks refused to accept at team hotel. Glen Grunwald not at practice yest, gm today. Rockets had a courier knocking on doors at hotel, call room. Could not get someone to accept offer sheet yesterday. Rockets FedExed offer sheet to Knicks offices in NY, but league said GM Glen Grunwald must receive it himself. Clock to match at standstill. All of this is high comedy, but does leave no doubt that Knicks will take every bit of three days to match, once offer sheet is in hand
I'm envisioning a scenario where Glen Grunwald gets served his papers in the Knicks' locker room at Summer League. It'll be a great, great moment.