1999 1 Cent Mated Pairs?

Dear all,

Pardon a newbie question of mine.

There are these 2 error coins that have been certified by NGC. According to the online certification, the coin information is as follows:

1. 1999 1C 2 PLANCHET DOUBLE STRUCK CAP DIE
Denomination: BONDED
Grade: MINT ERROR MS 66 RD




2. Date/Info: 1999 1C OFF CENTER OBVERSE BROACKAGE
Denomination: WITH
Grade: MINT ERROR MS 65 RD



(a) Would anyone be able to point to me what "BONDED" and "WITH" denominations mean? I did a google but could not find the answer to this.

(b) As shown on the attached pictures, there are the "mated pairs" stickers on both slabs. Are these coins indeed mated pairs? I did a google on the types of error coins and these do seem to be mated pairs. If this is indeed the case, why aren't it stated on the slabs?

(c) Are these 2 coins valuable? If yes, any indication of the expected values? (not that it will be on the market anyway)

Thanks...