• Present perfect if you would like to say that from the time you put the mousetrap until now, there have been two mice that got caught.

This is the most common situation

• Simple past if you would like not to use since as a time marker but to suggest causality. In this case Since = As

Why was there a mouse in the kitchen yesterday?

-A mouse was caught since/as we put a mousetrap in the kitchen.

• Lastly since as a time marker + simple past can occur if the action didn't last throughout the period.

Yesterday was the highest recorded temperature since 2007.

In this case we set up a period from but the action is only punctual.

• Present perfect if you would like to say that from the time you put the mousetrap until now, there have been two mice that got caught.

This is the most common situation

• Simple past if you would like not to use since as a time marker but to suggest causality. In this case Since = As

Why was there a mouse in the kitchen yesterday?

-A mouse was caught since/as we put a mousetrap in the kitchen.

• Lastly since as a time marker + simple past can occur if the action didn't last throughout the period.

Yesterday was the highest recorded temperature since 2007.

In this case we set up a period but the action is only punctual.