Digging deep

I started to dig in my garden, almost at random. I unearthed a small red weight, like those used on old fashioned balance scales.
Then another and after a bit, one more, each deeper than the previous.
I kept on digging, getting excited by now and gradually unearthing a complete set, together with a red metal box to keep them all safe.
A memory returns of losing them when I was a boy.
Balance is restored.