I received my I2 last week and never been fly since I have the same props rattling issue.
I can confirm the 8 props (4 red 4 white) that come with my pack, all of them have foam, and 3 of them have digit "2" under it (2 white 1 red). Here are some photo about my digit2 props. And also a quick video showing the rattling on both foamed and digit2 version.
Here are the brand new motor and props rattling
Compare between the digit2 and simple foamed props (start from 3:30)
I can confirm the 8 props (4 red 4 white) that come with my pack, all of them have foam, and 3 of them have digit "2" under it (2 white 1 red). Here are some photo about my digit2 props. And also a quick video showing the rattling on both foamed and digit2 version.




Here are the brand new motor and props rattling
Compare between the digit2 and simple foamed props (start from 3:30)