Request a health card?

Hello everyone,

If I request a new health card and find the old one, can I still use it?

My dad was out with the card and gave it back to me. I had to do a few things with the card and fill out some paperwork. But I didn't put the card back where it belonged.

If I find it at some point and get a new one in the next few days, do I have to throw it away or can I use it?