The original box is ideal for this as you can store it as it arrived using the openings in the padding to keep the chain separate.
Remember to take your jewellery off when swimming, bathing and playing sport, and when doing DIY or gardening or handling any metal objects. Avoid wearing your pieces in bed, especially necklaces which can become tangled. Avoid wearing gold rings on the same finger as rings made of another metal, as they may be damaged with wear by harder metals.
Matte surfaces may polish up over time through contact with skin for example. If you want to restore the matte finish, you can use a mild (usually green) scouring pad and gently rub in one direction only. You should test this on a concealed surface first. For the oxidised (blackened) silver surfaces, this tarnished surface can polish up a little over time, showing through some grey-silver colour, adding to the character of the piece. To avoid too much grey- silver showing through, avoid using the baby toothbrush on these parts and just wash gently with a mild detergent like washing up liquid.