All hackers who check in for our events receive a postcard and stickers packed in a letter envelope. If you demoed a project, you'd also get a limited-edition I Demoed Sticker.
Inside the US, you should get your letters 1-2 weeks after they send. This can mean up to 4-6 weeks after the event.
Outside the US, you should get your letters 3-4 weeks after they send. This can mean up to 6-8 weeks after the event.
In India particularly, we see wildly different delivery times in different parts of India. If it's been more than 12 weeks since the event, your letter may have been lost in the Indian postal system.