Karabor Priest's Boots is part of the transmog set Karabor Priest's Vestments (Priest, Mage and Warlock only), which the Appearances collection lists in 2 versions. The other 9 pieces:
Blizzard numbers items as they are created, so the named items next to ID 234864 (234859 to 234869) were usually added in the same batch as Karabor Priest's Boots: the same quest line, zone, vendor or reward set.