Hi Patrick
There are no base level for any of bos.rte filesets, consequently, filesets bos.rte and bos.rte.<anything> can't be manually located in base media; they can be installed only during offline or nimadm operations which are the supported methods for migration (for example from 7.2 to 7.3)
For migration using offline method:
https://www.ibm.com/support/pages/preparing-migrate-aix
For migration using nimadm
http://www.ibm.com/developerworks/aix/library/au-aix-nimadm/index.html
Please advise the error/reason you are looking for bos.rte as this may give clues as to why.
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Regards Chris
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