Currently, when you find a new antiquity lead, it’s automatically placed into your journal under Antiquities. It’s then available for any of your characters to track down. However, the antiquity leads come with a countdown timer and after it expires, it’s no longer available for digging up.
My daughter is a more casual player of ESO, only has one character on her account, and the character is only level 20. So far she has two purple and one gold antiquity. At the moment, she is pursuing other skill lines, and with the amount of time she devotes to ESO, the antiquity leads will expire before she has any chance to hunt them down.
So here is my idea. When finding an antiquity lead, instead of going straight into your journal, you receive the lead as either a book, scroll, or paper which goes into your pack under supplies. It then just sits there until you use it, at which time the antiquity lead is marked in your journal and is now available for you to hunt down. If you don’t use the antiquity lead, it remains as a book, scroll, or paper, which you can then trade to other players or sell on guild vendors.