iTunes Match does not identify some tracks on albums purchased from iTunes store

I recently subscribed to iTunes Match so that I could upgrade some DRM protected music purchased from iTunes before 2009 to play on my new Sonos Play:5. However, iTunes does not mark as 'Matched' or 'Purchased' some tracks on some albums, even though 'Get Info' shows that all tracks on the album were purchased at the same time, and these tracks are currently available in the iTunes store. How can I rectify this?