First, the rules pertaining to negatives hold true. Each negative line must be removed by "seven years plus six months" from the date of first delinquency. Those IIB lines may say IIB, they can't be dated any later than discharge (some say filing), and can only reflect the status at the time of filing, so if something was current when you filed it must show no negative other than IIB.
Those negative lines will age until they fall of in, as I said, at most seven years and six months from DOFD. But some creditors will update monthly with a status date later than the BK, which makes them seem like current derogs. In a couple of cases I had to dispute with CRA then file a 623 letter but eventually got them all fixed.
