None (except maybe the baseball cards) of that needs to be reported, as previously discussed. It's only a "garage sale".
You can just omit the 1099-K. Or, use the workaround as described by mysticr.
Just reporting the total income, on the 1099-K, is not necessarily the "easy way". Not only will you pay unnecessary income tax on phantom profits; you risk waving a red flag at the IRS about self employment.
