can you try "opkg files libmraa0"?
This should list you the files which are supposed to be part of the package.
Also: in case you need to check a repository I wrote a brief blog a while ago: How to inspect ipk packages
I tried to upgrade the library too and had this as result, I'm assuming that it is the same output that you had:
I ran the blink-io8.py example (I changed the pin from 8 to 13) and it was working fine.
Did you try to use the library after updating it with opkg?
Is the library working now?