Got him!
Baited the glue traps with peanut butter, and sure enough, I come home and he's squeaking like crazy. Both front feet and half his face stuck in the glue.
Drove him about 2 km away and managed to unstick him without using vegetable oil as suggested, but simply gently smearing the remaining peanut butter under his little paws/feet and let him go.
I will be keeping the other traps around, as I'm sure there will be a couple more, from what I've read online.
Also, found this page on catching mice. A cool homemade trap that seems to work pretty well if anyone has a similar issue, although my glue traps seemed to work fine.
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