Would you consider this as being they ate it all?

Here it goes.
I live with roommates and we label our food and whatnot. I bought a box of cereal when I went shopping. I get everything put up in my area. Everyone knew that it was mine.

I get up this morning and my box of cereal is in the trash. It was empty. I asked one of them if they had any thing to do with it missing. I was told that my other flat mate had cereal last night.

The good flat mate didn't eat it and I didn't get a bowl either. The bad flat mate said he only had one bowl.

Would you say that the bad flat mate ate it all?
I know he is an asshole of a pig.
Would you consider this as being they ate it all?
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