If you lose your AdSense cheque or if it never arrived, you can ask Google to re-issue you with a new check. 

Here is how it works:

1. Regular Post

If you receive payments by standard delivery cheque (i.e. regular post), you can ask for a re-issue of the payment made after the 25th of the following month.

For example, to request a re-issue of a cheque originally dated 15th of March, you would need to write to Google after the 25th of April.

2. Secured Express Delivery

If you receive cheques by Secured Express Delivery, you can request a re-issue after the 5th of the following month.

For example, to request a re-issue of a cheque originally dated Feb 15th, you would need to write to Google after March 5th.

To request a new cheque, please contact Google here and specify the number, date and amount of the cheque that you would like re-issued.

You can also find this information by visiting your Payment History page and clicking on the details link related to the payment for the appropriate month.

Let me know if you've had any issues getting re-payments sent to you.