I saw a couple of 1099s in mail today.
1) All over $600 (one $601, jerks....)
2) Cards are not combined, they specifically say in bottom left corner for which account it is.
3) Mine does have last 4 of SSN, you may want to double check that Dan. (Unless you mean AUs that never got associated with SSN?)
4) SR is valued at $79, and "Next shop at ______ receive $X" SCs are valued at face.
5) Shared FB gifts are only valued at face of one of the gifts, not all 4.