I have moles and voles, I think the little voles like to use the tunnels the moles dig. So I could see the moles digging around the bulbs and the voles using the tunnels to get to the bulbs.
Anyhow what caught my attention was using the plastic ice cream containers. I love using those things for planting in, and the thought of using them for bulbs sounds great too. I try to buy ice cream in the 1gal.1pt plastic containers, they are my favorite. Now I am trying to cut back on eating things like ice cream and thinking about collecting more of those nifty plastic containers is not helping.