So all that is left is that oslevel does not show 4.3.3?
If that is the case see below
oslevel may not indicate 4.3.3.0
The oslevel command may not correctly output 4.3.3.0 on systems installed or
updated from the AIX 4.3.3 product media for the following reasons.
The level of the ifor_ls.compat.cli fileset on the AIX product media is at
the 4.3.2.0 level. This problem can be corrected by installing the
ifor_ls.compat.cli 4.3.3.0 update (PTF U466561), which is available from
FixDist. This problem does not occur when updating from the 4.3.3.0
Maintenance Level.
The bos.perf.pmr fileset is down level after updating from the AIX 4.3.3
product media. This occurs only when updating AIX 4.3.0 and 4.3.1 systems,
which already have the bos.perf.pmr fileset installed. The bos.perf.pmr
fileset is obsolete in AIX 4.3.3 and should be removed.
The bos.crypto* and sysmgt.security* filesets are not included in
the AIX 4.3.3.0 Maintenance Level since they contain encryption code
that is subject to export restrictions. Updates to these filesets are
available only on the AIX 4.3.3 Bonus Pack that is shipped with AIX 4.3.3.
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