As deskription says. In version 1.6-1 of the Debian package xkb-data (which corresponds to version 1.6 of xkeyboard-config from 2009-05-24) br(thinkpad) and br(olpc) are not described in /usr/share/X11/xkb/rules/base.xml. I suppose the reason for this is that in /usr/share/X11/xkb/symbols/br they both use name[Group1]="Brazil"; rather than something like name[Group1]="Brazil - Thinkpad";
The are not going to be in base.xml. These symbols are used for models olpc and thinkpad - according to rules/base, they are 'default' for those models. No need to expose them for other kbds.
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