I logged in a day or so later and again noticed I had no egg and tried to rectify that situation.
Now I'm on my 4th egg this week and they keep vanishing out of my bags. I don't think they're lost in 'overflow bag space' because I do have space available and it does keep letting me buy eggs, which should be unique.
Any thoughts? Is this a feature to up the Mysterious value? Mysterious-er Egg?