The source article for this brief could not be read — the page returned only a bot-verification screen rather than its actual text — so we can't verify the specific 'rediscovered items' it refers to. Rather than guess at details, here's the reliable picture for anyone planning a visit to Buckingham Palace.
The palace in Westminster is the British monarch's official London residence and one of the city's biggest draws. Its State Rooms open to the public for a limited summer season, typically July through early October, when the monarch is away at Balmoral in Scotland. Tickets for these visits are timed and dated, and they routinely sell out in peak weeks, so booking ahead on the Royal Collection Trust website matters.
A standard State Rooms visit takes roughly two to two and a half hours and includes the Throne Room, the Picture Gallery with works by Rembrandt, Vermeer and Van Dyck, and the Grand Staircase. The Garden Highlights tour and occasional special exhibitions change year to year, and the Royal Mews and the Queen's Gallery next door are open for longer stretches of the year, making them good alternatives if your trip falls outside the summer window.
On the rediscovered-items angle: royal collections do periodically turn up long-lost pieces — furniture, paintings and objects reattributed after research or found in storage — and they're often folded into the summer exhibition themes. If that's what drew you to this story, check the Royal Collection Trust's current exhibition page before booking, as the annual display theme changes and is announced in advance.
Who this matters to: first-time London visitors deciding whether the palace is worth a ticket, and returning travellers who've only seen the Changing of the Guard from the gates. For the former, it's one of the few chances to walk through a working royal residence; for the latter, the garden and special exhibitions are the freshest angle.