According to bahnhof.de, Böblingen does not feature lockers.
However, as a general note to anyone who might stumble upon this thread while looking for an answer to the question as to whether a certain station has lockers or not, I can tell that usually stations that are only being served by S-Bahn usually don't have lockers, while the chance for other stations where RE, IC or ICE trains are stopping, chances should be higher. However, that is not a guarantee, as Böblingen, for example, is a station with RE and IC connections, but doesn't seem to have lockers. The best bet should be a search on bahnhof.de (only available in german, though).