Find a wallet every week containing $10 or $10,000. Keep it?

Ok, every week you randomly find a wallet containing either $10 or $10,000

Each wallet contains contact details of the owner, who is always within walking distance of where you are when you find it.

Any wallet containing $10 belongs to a rich person who won’t miss the money.

Any wallet containing $10,000 belongs to a person to who cannot afford to lose it.

Whether you choose to keep or return the wallet each week has no legal repercussions, and no one will know unless you tell them, including the owner. Obviously though, the owner themselves will feel the repercussions, meaning either not at all or very much, depending on the chosen wallet.

What is your strategy?