Whenever I check on my normal female and het pied male, I never see any locks. I do see lots of tracks all over the paper though. I clean the tubs once a week, sooner if I see poop or they tipped over any water bowls. So at least once a week, (roughly each time I pair the two) the female is leaving tracks, but I don't see any locks. I've only seen one successful lock at the very beginning. Do the tracks mean they've been locking or is she just spreading her scent around and he's just not interested anymore?
I've palpated a few times, but I'm not feeling anything. Of course, I might be doing it wrong. Her belly muscles push against my fingers too hard for me to feel anything.