Neither the $5800 or the $5300 is your reportable income. Your reportable income is the difference between what you sold each item for and your cost basis (usually what you paid for it). Your report only the income on items sold for more than your cost basis. Your ignore the items sold for less. As, other said, some items, sold for a profit, may qualify for capital gains treatment. If all items were sold for a loss, you have no income to report. However, the IRS gets a copy of the 1099-K and may be looking for it on your return.
There is no specific place on the tax forms to account for a 1099-K. For a detailed discussion, see this other thread here, in the forum. https://ttlc.intuit.com/community/taxes/discussion/i-sold-some-personal-items-on-ebay-and-received-a...
