OP here. Wow, I can't believe this thread got so many responses! Thanks for the kind comments and the er....interesting ones. Besides this egg salad bowl procrastination, I tend to let returns sit around way too long before getting around to doing something about them. I think lots of people procrastinate on things they don't want to deal with.
Basically, the egg salad bowl was something I did not want to deal with after it had been sitting out a few days. That turned into a month given a bunch of other stressors going on. I know I should have done something about it, but I procrastinated. I have a problem coping with stress, I am just not very good at good coping techniques, and when I'm stressed I let things some things slide, like this. I know a month is a long time and lately I've been feeling bad about the egg salad bowl. It did not smell until a few days ago, it was wrapped pretty well with saran wrap. The contents aren't attracting bugs or other nasties. I have a nook on my counter that is out of the way and I put it there to be dealt with later.
I am not a hoarder. My home is extremely neat and tidy except for this month-old egg salad nastifying on my counter.
Anyhow, I appreciate all the insight about the egg salad bowl and what to do with it. I have made my decision!